The two stats that I am most interested in are SpA and Speed, and it is around them that I will be basing my voting decision.
Low SpA will give us more freedom in choosing whether to give CAP4 Calm Mind/Nasty Plot/Quiver Dance/Tail Glow and will benefit No Guard in allowing us more freedom in choosing coverage like Thunder/Blizzard/Focus Blast.
I am not certain, but I think Weak Armour will be used more if CAP4 has a lower Speed. So at the moment, Mari (103 SpA, 77 Spe) and DarkSlay (105 SpA, 78 Spe) are my top stat spreads. I was initially excited by Deck Knight's 86 SpA but I can't imagine anyone bothering to use Weak Armour with 108 base Speed... Feel free to argue otherwise.
If I haven't seen further, it's because giants were standing on my shoulders...