Predates it so much that it was a complaint with original iPad, and has resurfaced as a complaint with every update since. It is nothing new, and it appears to be a reoccurring theme that a certain percentage of people have problems after an update. Most seem to resolve it after a bit, or stop talking about it at any rate. I don't think anyone has done a serious poll or research on it since the iPad 1.
Battery life complaints also get a refresh every update, though there was a stronger than usual peak with the 5.0 update; enough that Apple admitted to there being a problem.
There seemed to be a swell after iOS 5, because there were a bunch of tech blogs writing about complaints. No telling how many people had probs, though. Wonder how many actually complain to Apple.
Battery probs seemed to swell with iOS 5, too.
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