We're working on AKU 3.5 now, and it's pretty close to being all good.
so far, no "clean" WM6 exists to base a rom kitchen off of. Rumor has it we may even get an official WM6 release from UTStarCom in the summer timeframe, but it's just rumor for now.
Frankly, the leaked WM6 info is kinda "ho hum" vs aku 3.5 anyway. Sure it would be nice, but it's not got much you couldn't do without anyway