Jay Yarow's done the homework and determined that if Apple takes the stage as expected at WWDC, it'll be 230 days from the last big Apple event. That would make this the longest wait for a new Apple event ever, at least since the iPad's launch in 2010. The previous record was 132 days between the launch of the MacBook Air and the iPad 2, so this wait trumps that by at least three months.
Yarow cites that wait over at Business Insider for the recent drop in Apple's stock price, and indeed, you can see on the line above that Apple's stock does seem to line up to the reveal events. But there are a lot of factors going into that stock price. The difference in event timing could just be attributed to CEO Tim Cook -- as Yarow notes, he's a very different person from Steve Jobs. Cook has suggested that the company could be a little more careful about new product releases, in order to line up more sales when the release actually arrives.
Whatever the reason, it seems very likely that Apple will host an event at WWDC in June, if not before. It's unknown if that event will feature new hardware. Usually Apple uses the WWDC event to show off new version of iOS and OS X. But considering the wait, it seems likely Apple has something to show us.