Can you believe, the last official Google Panda refresh/update was Panda 4.1 on September 25, 2014? We've seen updates to it since, but those updates stopped around October 24, 2014, which is 5 months and 2 weeks or so ago.
I asked John Mueller of Google in a Google+ handout at the 47:50 mark in the video:
There hasn’t been a Panda update in a while, since October or so, right?
In John fashion, he answers:
That’s possible, yea.
Watch the video to see how he answers it:
We know Google has to push these updates, at least now, but hasn't in about 6 months.
A half a year is a long time to wait for a Panda refresh, don't you think?
Forum discussion at Google+.