Although the keynote where iOS 6 with a new Maps app, a possible slight change in iOS' UI color scheme, Facebook/iOS integration, new Macs and more are rumored to be introduced, is still a few days away, an indication of what we're to see is already apparent thanks to multiple WWDC banners that have been hung around the Moscone Center.
Kieffer Bros. has just released a beautiful new game for the iPhone and iPod touch called Orba [App Store]. Orba is a screen-clearing game which uses colored orbs as playing pieces. To clear pieces, simply tap orb groups containing three or more same-colored orbs. The larger the group, the higher the points. When you're out of moves, more orbs fall in. As you progress, the game introduces more colors which increases difficulty.
It sounds simple, but it's incredibly addicting! Orba is free right now for a limited time, so grab it while you can. Gameplay video follows below!