SearchMetrics reports that 10 of the 30 sites they reported being hit, saw a 80-90% of their visibility improve. But they also said that other sites did not see an improvement.
I spoke with one of those sites (can't disclose, I am sorry) and they said they saw a recovery on October 7th. They even proved it to me, that they fully recovered. So it makes it hard for me to believe the SearchMetrics reports, even if the results are positive or negative.
Yes, Matt Cutts tweeted on October 5th:
So we know we are expecting updates to Panda 2.5. I doubt this is a "roll back" of it, but tweaks. I have not seen mass reports of recoveries, although I have seen reports of recoveries.