I have been awaiting the fresh batch of late rev Whitestar boards Stern said they were producing. I got fed up with wondering when it might happen and e-mailed Pinball Life to see if they had any info (to help me decide if I was going to send off my badly corroded board for an attempt at resurrection,) and low and behold, I received an e-mail in reply that they had got them in this morning and were now added to the website!
I see K's Arcade has also added them, though most of the other vendors I checked so far still say out-of-stock.
When I spoke to Stern a few months ago I did not ask about early version boards for the games which the later rev isn't compatible audio-wise since I wasn't waiting for one of those, but it couldn't hurt if someone who is calls them up and asks about future availability. Maybe bugging them will convince them to produce some more.