We have a gist of the mechanics...
Capture points across a wide map = high mobility champions shine.
Mostly PVP = Assassins and Carrys shine a bit, but squishy champions are going to suffer a bit.
Very spread out fights (Probably going to have 3v3 at top and 2v2 at bottom, or maybe 2v2, 2v2 with a wander champion for backdoor) = TF and Pantheon will shine, but pure tanks won't be soaking up alot of damahe.
There's a variety of things we can already assume based on the information we have so far, so it's not like it's impossible.