Well, as we know from recent years, we don't see new innovative hardware at WWDC. Admittedly we haven't seen new innovative hardware from Apple at all for some time. But if there is going to be some innovation this year, it's likely to be in September/October. Announced alongside the next iPhone.
From the rumours we've been hearing Apple may announce an iWatch this year, larger iPhones (up to 5"), and possibly an Apple smart TV. But, rumours aside, if it's going to happen, there's a few months wait yet.