It looks like a Wi-Fi-enabled version of the Pixi is hitting Verizon next year, at least according to this FCC filing. The filing shows CDMA/1x EVDO and Wi-Fi support along with Bluetooth and matches with the expected P121EWW model number (Sprint’s is P120EWW).
So if you’re on Verizon, love you some Wi-Fi, and would consider the Pixi, rejoice. Otherwise, don’t.