So, in order :
- Probably not
- Doesn't seem like it
- The demo confirmed that yes, they do work like z-moves (although, every move has the same side-effect based on his typing but they are way less strong than z-moves. For example, the dynamax version of Double-edge is "only" 150 bp (but it slows the opponent and doesn't have recoil) )
- Probably not, it's already limited to 3 turns, i don't see it being possible to switch during that time
- I don't know if it comes from leaks or the demo, but nearly all side effects of dynamax moves have been dropped. It should be easy to find. If not, i have this : https://docs.google.com/spreadsheets/d/1f6nll_1FTDVYR2wVxUHuyqWxTOQtU6kO7_ibcY2Lf_0/htmlview#
- That would be strange. The dex already completely leaked, if there was more gigantamax forms, we would know of it.