If we already know it has tumbleweeds, what else could there be worth guessing about?
I wonder what multiplayer maps will be in the release though, clearly some of the maps from 1.09.4 flat-out stunk, and others would probably need significant overhauling to work with the new system.
Also, I speculate that Tails will be a much more viable character in match. Considering he used to be so sluggish before that flying was crippling, the speed buff is probably going to turn him into a great character for evasive/tactical strategies.