"Surprises" in store for Android at Google I/O?

Android 1.5's already been detailed and its accompanying SDK fully released, but does Google still have a few aces up its sleeves for this release? As you might recall, Google's I/O conference last year was an unexpectedly blockbuster event where a mostly-finished Android 1.0 got detailed in depth for the first time, and a new blog post on the official Android Developers Blog alludes to "a few surprises we've lined up" that we're hoping will make the event worthwhile for non-dev types -- people just looking to see the platform advance. The event goes down on the 27th and 28th of May out at Moscone in San Francisco, so we'll know soon enough.