Perhaps, but there has not been major press on every news network about the secret android prototype as the next version of the Droid. Compare that with the press circus around the apple prototype. I have not seen android news pushing much beyond tech press.
The new iPhone rumors began in January, and culminating in the massive leak last month. I think this had a big impact on sales. Since Apple does not do constant incremental upgrade like other manufacturers, I think it more likely to be subject issues of waiting and pent-up demand. And, unlike with many Apple products and update cycles, the general public is pretty well informed on the new iPhone to come.
As you said, every day you read that is a slightly faster/better android phone, so some people might wait, but if upgrades are constant, it would argue for less seasonality. You buy when you need that new phone. That is not the case with the iPhone, there are big surges with the new models, which come yearly. That is seasonal adjustment that needs to be modeled into the time-series.