Given that Wes Schneider, who came up with Bastardhall, is now working for WotC and can't freelance for Paizo, I'd say the hopes for that are close to zero.
I'm sorry Mr. Schneider left Paizo Pubishing and I do wish to honor and respect his legacy but even though Bastardhall is his brainchild I believe it probably still is the property of Paizo Publishing and I think someone else could possibly give it the justice it deserves one day.
This is pretty unlikely. We've got a LOT of megadungeons we'd love to do, and Bastardhall is only one of them. And since it was Wes Schneider's focus... out of respect for him having left the company, I'd rather focus our megadungeon attentions elsewhere.
While I understand that I am hoping that one day Paizo Publishing will indeed give us a Bastardhall megadungeon. Until then, like the Strigoi who slumber in tombs beneath Ustalav, I shall wait patiently. ;) :D