Fundamentals show that Apple have had a linear and continuous growth since the launch of the iPhone. No actual data suggest that this will change anytime soon. Meanwhile the AAPL stock is highly impacted by a succession of self-realized prophetic hype cycle...
My very dumb guess, that however had been proven true already 3 times in the past, is that 2009 linear trend is a really major and strong resistance line. However when a stock is over-evaluated, even by the greatest analyst, correction ensue.
The chart should be pretty crystal clear about why this might be a very good time if you seek for an entry point for long term. However stay aware that it still may shake a lot until and after quarterly results.