okay I will wait a bit longer to see what happen, but it used to never to this, both miners always showed predicted payouts. On a different note the p2pool-note-status static page has been updated, it now shows the "payout if block were found now".
"Predicted payouts" is misleading because it sounds like you will be getting a payout. It's actually just the total value of your shares in the share chain at that moment, same as if you click on Payouts on the Extended interface. If a block it paid out right then, that's the amount you'd get paid, because that is your total share value in the share chain. It doesn't mean the pool will find a block (you might get paid zero). The pool could also find many blocks (you'd get paid that for each of them).
On my nodes I've changed it to say "Your Share(s)", hoping it's more intuitive that way.