Update 3 was just released a few days ago and we already submitted the next one! Here's the feature list:
* WEAPON OVERDRIVE: attack your rivals with unprecedented power!
* New paint jobs for Wraith, Shrieker and Sentinel
* Two new challenges: Dollar Challenge & Ammo Challenge
* Two new leaderboards: Victory Count & Kill Count
* Fame is now correctly restored based on Game Center information when choosing Restore Progress
* Achievements for unlocking tracks are now given retroactively if they have been unlocked earlier
PS. Here's a really cool Eureka wallpaper that Heikki created: