All things considered, I'm still good with my original iPad.
About the only thing I can think of that they could add that they haven't already would be the retina display. However, having said that, I have to remember that the iPad is essentially a revolutionary device. It's literally created a market that didn't even exist for all practical purposes just a short while ago. While it may not be apparent right now, I'm sure there's an iPad 3 and 4 and 5 in the pipeline that may well revolutionize the tablet market just as surly as the original iPad created it.
Stay tuned to this station for further developments.
Tom (... e pluribus... Apple!)