i'd love to see several different tag teams come back in:
one that i read more than once on here would be Jericho/Carlito. the finisher of a back stabber into a code breaker or a code breaker into a back stabber would be awesome. can't think of a reason they should pair up, but the finisher is still awesome!
Carlito/Primo should get back together. they were a good team and both need to do something other than job on Superstars.
Goldust/Cody Rhodes would be fun. plus, it could bring back Dusty as a manager, maybe even feud with Ted & Brett Dibiase with Ted Dibiase Sr as a manager. get the dads involved as they had a pretty decent feud back in their day.
we already know about the Fortunate Sons coming in, which will be great.
Hart Dynasty is already in and they're great.
maybe reform MNM now that Joey Mercury is back. they were a great heel tag team and could be so again.
do something to reform either Crime Time or the old school Nation of Domination idea. both would be great.
there are enough wrestlers from Canada and overseas to do an anti-America stable with teams. i know it's been done, but WWE is in need of some good tag teams and this is an angle that would work, even though it's been done before.
Edge and Christian or Rated RKO could reform. both were great tag teams, though i'd much prefer to see Edge and Christian. they just reeked of awesomeness. plus, they'd be the perfect guys to dethrone a really dominant tag team.
as far as dominant tag teams go, i'd love to see either Big Show and Great Khali team up, or Big Show and Kane reform, or Kane and Undertaker reform. i love those dominant team angles that are just so tough and beat everyone up. my first pick would be to see Big Show and Khali team up and go heel, then have Edge and Christian turn face and beat them after a series of matches for the titles. but perhaps this is all just too much wishful thinking...