We’re two days from Apple’s “Let’s Rock” event and the Yerba Buena Center for the Arts in San Francisco has been decked out. Yay! Moving on.

Ars is reporting that they’ve caught wind from a “little birdie” that Apple will release iPhone firmware 2.1 on Tuesday along with new iPods. So what can we expect from 2.1? Earlier reports suggested better GPS functionality and, Jobs willing, push service. However, Ars is also suggesting that a few hidden gems were withheld from developers. So, what sort of surprises can we expect this Tuesday on the iPhone front?