Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
With the new iPad, will all the retina optimized apps be 4 times larger?

No. Not if graphics are designed in vector, however app sizes might increase dramatically for games which feature more details textures, HDR lightning and more polygons.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.