Why hello there. Camille's been out on PBE for a week or so. I've spent a bit of time watching a few Camille games (often dittos, which were hilarious to watch). This woman seemed to be my kind of champ, so I gave her a shot or two too. Sooooo...here are some initial thoughts.
Camille's Niche
Highly mobile AD-based initiation/aggression bruiser.
Pros
Elusive early-game, making her very hard to gank even in top lane
Very strong sticking power
Powerful jungle duelist
Untargetable dash
Physical, magic and true damage, including %health scalings
Can function late-game with either tankier or more damage-oriented builds
Feels great and fun as hell once you get used to her
Cons
Questionable strength vs mixed comps
Disengaged from very easily outside of lane
Mediocre waveclear
Gets absolutely ruined by CC in teamfights
Very feast-or-famine-ish
Requires precise control in order to achieve optimal play
Camille's Damage
Camille's a physical damage-oriented champion first and foremost, but her Q gives her access to true damage if she can stick to her target. Once Camille gets her Ultimate, she gains magic damage equal to a portion of the target's current Health as long as she's in the zone. Adaptive Defenses
This is very important for anyone who plays Camille. Attacking an enemy gives Camille a Health-scaling shield to protect from their primary damage type; for example, attacking Yasuo will give her a shield to protect against physical damage, while taking a swing at Elise will give her a magic damage shield. As you can imagine, there's no way to protect against both types of damage simultaneously (unlike most shields). As a tradeoff, the shield strength is a whopping 20% of her maximum Health - just enough meat on it to stuff less impressive early-game damage. The shield acts as incentive to make the first move in fights and trades, nullifying many panic options. Thus staying unpredictable and on the attack will usually draw the best use of the shield, as opposed to playing reactionary and defensive.
This can backfire in lane however, and it will backfire hard if you let it. Champions with high mixed damage early game, such as Shen, Singed or Tahm Kench, can work around this shield through their damage, particularly if they have high DPS to shred the shield while continuing to whittle down her health, staying up close in order to not give her Tactical Sweep's incentive for landing the long-range kick. The 20-second cooldown of the passive enables adversaries to jump on her in this window to lay down large portions of hurt without much opportunity for a worthy return trade. In order to use this passive to its fullest, remember that Camille ought to be the one to set the pace of lane, NOT her opponent; If control of the lane is lost, it will take a lot to get it back.
When you make the first move, the shield acts as incentive to keep the pedal to the metal and out-trade.
Power spike
Camille gets going in the early-game, particularly between levels 4 to 6 where the damage from Precision Protocol really starts to hurt. As with other snowbally champs like Diana and Riven, the length of her power spike hinges on her success in lane; if she loses the momentum, she is easily countered by simply grouping up and taking objectives, since she's only an average splitpusher. If she can continue pushing her advantage past level 9 this is when she gets super scary, being able to give (and take) a ton of damage in a moderate timeframe. Reaching six items before her opponents will give her team an immense leg up provided they give her the ward support and followups on her engages once she makes a move in a fight. Regardless of how poorly she's doing, if there's one thing Camille can always do well past lane phase, it's initiate a teamfight by isolating a key threat (or several) through proper use of her ultimate. The timing of its use makes or breaks fights however; sometimes it just makes more sense to ult on the tank for peel, or in order to make it clear to your teammates who priority number one is in your mind. But don't push melees too close to your ADC however! Keep in mind where the rest of the team is going to be knocked to when you ult someone.
Camille in the Jungle
All in all, while I do think Camille is best suited to top lane where she can exploit all of her strengths to the fullest, her jungling isn't bad. She has sustain, a stun, an attack speed steroid, %health damage, and auto resets to rack up DPS on the camps. Hookshot helps her get through the jungle pretty quickly when she has blue buff. Unfortunately, if you're picking Camille in the jungle, she doesn't have a lot of tools there that aren't outclassed by Lee Sin's. What she does have going for her, however, is a slightly better late-game thanks to Hextech Ultimatum (her ult) that can have more catastrophic effects on teamfights.
Example build 1
You have to choose between super tanky and super damage-y going from game to game, but in an average Camille outing, I think you can rely on this path.
The Black Cleaver
Boots of Swiftness / Mercury's Treads
Frozen Heart
Banshee's Veil
Frozen Mallet
Dead Man's Plate
When it comes to Camille and bruisers like her, Black Cleaver is love, Black Cleaver is life. Camille loves everything about this item, from the armor-shredding damage to the movement to the Cooldown Reduction. You can augment Camille's tricky movement even further with Boots of Swiftness, but given how Camille doesn't like getting hit by hard CC, Mercury's Treads can mean the difference between dying and being able to hookshot your way out of trouble. After this I've just built standard off-tank stuff, but Frozen Mallet and Dead Man's Plate have their own great benefits with Camille, a champion that likes to look for skirmishes and picks above full-blown teamfights. There may be more to add to this later, so if something noteworthy arises, I'll post it. I'll continue to play Camille right through to release! ...lol jk, Elementalist Lux is out today EDIT: Speaking of, this just popped up.