It's just going to get easier and easier to get 8085 haste and 5100 hit with 5.2 ilvls. And then it's just a matter of reforging to get the best combo.
I predict a lot of reforging OUT of haste in 5.2, unless we can somehow get to the next break point. Let's see how feasible that is...
Is the next breakpoint at 10124, when Vampiric Touch gets +2 extra ticks? Is that feasible with 5.2 ilvls?
To see if 10124 is feasible, I made a tentative BiS list for 5.2 and it looks somewhat like http://ptr.wowhead.com/profile=35167935
This does not include Sinister Primal Diamond yet, which procs for a 30% spell haste. It also doesn't factor in Volatile Talisman of the Shado-Pan Assault
's 55079 haste proc. Even ignoring those procs, this gear set seems to have about 12040 haste. I think, including prods, we could even get +3 ticks on SW:Pain.