Every so often I check out the One love for Chi site
for updates on Chi Cheng's condition. He seems to be making improvements. As for him making a full recovery? I just don't know.
As for Chi's gear? For a long time he was playing Fender American Deluxe Precisions. Notably, the 4 string model that had the big humbucker in the bridge position. That's what he was playing when I caught the Deftones playing a festival gig in Miami, and that was over 10 years ago.