Our cousins at iMore.com have been killing the iPad (3/HD/new) coverage today. The long and short of it is you've got more powerful iPad with a killer resolution, and a bunch of other cool stuff thrown in. You can't deny that it's still the tablet to beat, even though we're certainly bigger fans of the Android OS.
Anyhoo. The iMore kids worked up a comparison chart so you can get your specs on. Check it out.