I've heard another (American) name in the mix to replace Percy, don't want to start unnecessary comparisons and rumours though, although it's a pretty trustworthy source. Jeff Berlin is awesome of course but not sure he's right for Brand X. It's possible that the rumours have stemmed from twitter posts from a fake account pretending to be John Goodsall - see drummer Kenny Grohowski's facebook page for more. (You'll also see hints at the new drummer - Tobias?)
Shame really as I'm a massive fan of PJ - I saw BX at the Jazz Cafe in the 90s so tick in box there, but they had sound issues which took the sheen off and also it was the mid 90s so I've forgotten most of it. I've got tickets to see BX at Ronnie's and Trading Boundaries, when it became clear that John Goodsall wouldn't be playing it was the presence of Percy, the one remaining actual Brand Xer, that kept me on board. Touring the band in Europe without any BXers is going to be a pretty hard sell if you ask me.
Looking forward though - anyone hear Pakt? It's Percy's new outfit with Kenny Gr, Alex Skolnick and Tim Motzer.