The drive to have the Vita version run at 60fps is still strong. Extensive profiling is taking place to identify areas that could be optimised to ensure the Vita stays at 60fps throughout.
Various paths are being investigated with a new HUD already in place, saving valuable ms of processing time per frame. Current avenues of investigation include texture detail levels, character model structure and streamlined processing of off-screen information.
Potential release date is still unknown
Source: Twitch http://twitch.tv/dndn1011