I'm actually interested in the Herbivore ability on Afro-Bison. Though, very situational, this means that Afro-Bison will get a grass move or two. Therefore, if he comes in on a grass type move (granted, any immunity on a normal type is welcome) and gets the boost, he then gets pseudo-STAB on grass moves which would help it if there are is a rock type on the field (which would normally wall Afro-Bison's normal STAB). I'm assuming it will get access to Earthquake, as well, which would have taken care of Rock types (as well as Steels), so the Herbivore boost might end up being novelty if anything. It could catch an unprepared team off guard.
Puppy with pick-up is dumb. Albeit, Pick-up is useful in-game to get some good items (i.e. dusk, dawn, shiny stones in DPPt), I am hoping it evolves to get something a little better. However, I would like to see Pick-up get a boost. Such as they have a chance to pick-up items that get consumed by the opponent (kind of like an auto-recycle) or picks up items that the opponent drops after use of the move Knock Off.
Mold Breaker is going to be good with the additions to Sturdy. Bringing in a Mold Breaker pokemon will "break" the auto-sash just by being there. Too bad this gen's Mold Breaker's STAB isn't super effective on the usual sturdy Rocks and Steels.
Tabunne needs good defenses to utilize it's job right. With it's abilities and its showcased move: it seems like it is going to be this gen's support pokemon. In double's now, any pokemon now has instant-recovery thanks to Heal Beam, which is welcome. Hopefully it will get screens, wish, its own instant recovery, etc.
Denchura... um... let's hope it is a special attacker. 91% accurate Thunder is nice: but what if it gets 60 base Sp.Att.? Suddenly doesn't look so appealing.
I don't like the Coffin's Mummy ability. There aren't a TON of contact moves (especially ones that are used a lot), so I don't see it becoming helpful (unless there's a whole slew of new contact moves added) all that often. Taking Scizor's Bullet Punch to force its switch (or a weaker U-Turn... which Coffin resists) is useful.