Forget the 'Core' voice. They aren't going for that sound. Scott didn't sing like that for most of their career. Pretty much after 1994 or 1995 he abandoned it and after Tiny Music, it was almost gone altogether. If it is Pete, the guy can sing. He's got really great vocals and he's fairly well known in the industry as being a pretty top notch human being too - which no disrespect to Scott, Dave, Chester or Richard - the other guys in STP need something to go their way. If this guy can craft his own songs, sing the back catalog in a way that even Chester could, and he's willing to hit the road with them and play shows then why not?
I can't tell you what any of the back catalog will sound like but I can assure you any new stuff is going to fucking rock. Lo-Pro, Life on Planet 9, White Noise Owl and even as far back as Ultraspank, that guy can sing.
There are some fairly odd connections to him with the band and who they all mutually know. His newest band, White Noise Owl with Will Hunt were quiet and then fairly active once their record was done and they started doing some promo for it and then right around the time STP went quiet, so did White Noise Owl. White Noise is still quiet. They dropped a song from their upcoming disc, then vanished and it seems like all promo for them has stopped. Wouldn't it though if Pete had a chance to front STP for a bit? I don't see White Noise Owl doing massive tours. They probably planned on releasing a record and doing a small tour and then being done. They can still do that but to fit with STP's schedule now, Pete needed to take a break from them. Just seems like it fits all too well right now.
Some of the comments they have made the past couple weeks also seem that they could be describing Pete.