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They definitely have had their PR reset, but they're being cached now, and getting Google Search traffic.
Next test is to see if new inbound links will give them PR again.
Good news for domain recyclers.
However, keep in mind that I've bought plenty of expired domains in the past few months and I can tell you from personal expereince that you don't have to wait 6 months. In fact, all you have to do is ask.
I've bought plenty of expired domains in the past few months, put quality content on them, asked for a reinclusion request, and got those domains back in the index, with PR and links restored, in just a few weeks.
I think, though, the key was putting quality content on them and asking for a reinclusion.