Ashley

By Alola forms evolutions that are obvious, do you mean something like Alolan Meowth evolving into an Alolan Persian? Because while it is obvious it would happen, I wouldn't want to see pictures, unless it actually shows up in the demo.

But if it's a brand new Alolan Pokemon, then nope.

New Moves/Abilities is a bit of a weird scenario though. Personally, I wouldn't want to see them if possible, but it wouldn't be the end of the world if it slipped through.

It's mostly new Pokemon/Alolan Forms I don't want to know anything about.

I suppose any major story elements either, but I doubt datamining a demo can ruin that. Also it's Pokemon, the only decent story the mainline series has had was Black/White.