US iTunes is already showing the new icon:
The icon features Kimmo's favourite character "Easter Bunny", everyone else at the office would rather jump off the window (1st floor) than play as that character ;)
The update adds support for retina display (iPhone 4 only) and faster frame rate on iPhone 3Gs, iPod touch 3rd gen and iPhone 4.
UPDATE: We don't have iPod touch 4 at the office yet - it seems like the hires mode doesn't activate on it, also it's possible the faster frame rate doesn't activate either. This update was submitted around the time when iPod touch 4 was introduced so it's gonna need a new update to add support for it.
There's a huge difference in the level of detail between normal and retina versions:
For some reason JPG artifacting is more noticiable in the left side image, but other than that it's a fair comparison. I took the left side screen shot on an older iPod touch and the right side capture was done with iPhone 4.
You can download the update here: http://itunes.apple.com/us/app/minigore/id324016249?mt=8
bharter: Thanks for mentioning the missing link!