Hes returning for those who didn't know lol. I think he'll probably come back to face maybe Corporate Kane? Either that or he'll join the Corporation and feud with Punk while Bryan wins Rumble and faces Orton.

Thanks Taker_2004 for the banner!
Brock! Nah, just kidding... He'll likely come back and align himself with Triple H again though.
Maybe hes coming back to protect Orton in a best for business/Evolution-type storyline.
I didn't know that he's gonna be 45 when comes back! Yikes!
#CallingItNow: January 20th, Rumble go-home show, ends with a big brawl with about 20 guys involved. Batista comes out and cleans house, throwing them all over the top.

Batista joins the Authority at the Rumble but turns on them to face Orton at WrestleMania.
With him returning, I'm guessing the Goldberg deal fell through? With Rock taking on Fast 7 retakes, Austin not returning any time soon and Undertaker being tied up with Lesnar it seems, I figured that the Goldberg rumours meant that Cena/Bryan would have him as a tag team partner for a huge tag match at WrestleMania but I think Batista is the substitute. A nice one at that.
Who's he gonna fuck over? Daniel Bryan or CM Punk?
andddddddddddddddddd go