I don't think this is official yet, Watson just said he'd consider it if asked but nobody has asked him yet
It's not official yet, but all signs are pointing towards this. Every other possible candidate has denied even being considered by the PGA of America except for Fred Couples, and that's just because I haven't seen an article quoting him yet. Toms and Larry Nelson have both denied it, as has Azinger who was a long shot to repeat anyway.
If it is Watson, I'm good with that. He'll provide a much needed change of pace. It'll be interesting to see Tiger's reaction to this since he and Watson are known not to get along real well.