I think that full pre-measuring and random charges as per fantasy are pretty much a given. "Mysterious" terrain types like fantasy seems semi-likely, and terrain in general may follow fantasy's lead as well, with difficult terrain disappearing in favour of just having normal movement dangerous terrain, with some randomised types to further discourage players from just charging through alien forests etc.
I think that what's going to be more interesting are things like changes to vehicle rules to hopefully nerf the overly abused troop-transports. I'd love to see Overwatch make a return though, possibly alongside some shooting related penalty system, as while simple shooting is fine, it's a bit too simple right now.
Anyway, I think that 8th edition fantasy is a good place to look for the direction that 40k is going to take, I'd love to see universal war gear alongside an expanded universal rules section.