I seriously doubt this is true. High resolutions like that work well on monitors where stuff is browsed through windows... but unless the iPad abandons it's "full-screen" mentality the web would look awful...
As it is right now, the internet is not ready for such high resolutions... apps and games would be fine, but the web would not.
Actually the argument is the exact opposite. That games would not be so good at the high resolutions. I'll explain.
Having the web in full screen in your hand is a wonderful thing. It looks schmiko. Really good. And having it windowed on an ipad is a waste is pixels. Cause it's not like you can click on a background app bring it to the front, work there for a bit then move back to the browser as you can do on OS X. It's about best use of the pixels. And a full screen web experience for iOS seems to work well now.
Secondly Apple on the whole does not use independent resolution graphics. That's why this specific resolution was rumoured 2048x1536. It's a direct multiple of the current ipad resolution. So old ipad apps could just be pixel doubled to work fine. having the new ipad 2 ad a weird resolution would mean a lot more hassle for the developers to make apps that fit the new weird resolution. Having to re-write much of their app code.
And the question is would the new ipad have the gpu grunt to display 3d rendered images (often found in games) on this new high resolution screen? We just don't know. Maybe they'll have most apps at the new native resolution and the 3d games at a lower (but directly scaled) resolution.
And if you remember the Lion announcement, Apple is moving to full screen apps on OS X too. Well the option to run things full screen. I'd really like this if I got decent onscreen notifications if my other now hidden background apps had activity. A little off topic bot that's be nice for iOS too.