He said he planned to switch to the Xperia T, but I guess he will want to leave something at least workable for the S3 before that.

EDIT: not sure about the current state of things, seems that this is a translation from an interview that happened several months ago, which explains why the Xperia T wasn't out yet.

Yeah, I've kept a close eye on this since I own an S3 and run CM and he's definitely still working on it from what I've seen. That might be related to Samsung saying they'd be more open going forward though