Jesse McCartney, the voice actor for Roxas in the English releases of games in the Kingdom Hearts series, has confirmed via Twitter that localization for Kingdom Hearts -HD 1.5 ReMIX- is currently underway.
This is the first time that we've heard any confirmation of this, so it is certainly a big deal! McCartney uploaded a picture of work being done in the recording booth. You can see a scene from 358/2 Days playing in the background. This can be seen below.
Update: McCartney has uploaded a video of himself recording battle sounds for the game. In the background, footage from the title can be seen. We have uploaded this to YouTube, and it can be seen below.