More than anything I am concerned about the price. If the iPad 3 has LTE, retina, and the 4s's camera, I don't see how they could keep the price points the same. I'd love to be proven wrong on that. LTE isn't as big of a deal for me, I usually use my iPad indoors near wifi- but even with all the other hardware upgrades I wonder if the entry model will still be $500. I hope so, for me and everyone else. I can't sign off on a $600+ 16GB iPad just because it has a retina display. If they beef up the GB as well I could consider it. I don't really care about the home button- I use the gestures to control app switching most of the time these days. I certainly would not want to pay more for a buttonless iPad.
Either way I'm excited to see what's going to happen. I'm excited for any potential Apple TV upgrades and iOS previews as well. Only another week, hang in there, macrumors people!