Meh. It honestly doesn't really bother me... since I'm doing a lot of showing off my iP4 these days, I've pretty much moved the lower res icons into folders. I'll keep the apps I use most often out still but that's it.
I don't expect smaller niche apps like Codec Calc will be updated anytime soon, though I'm using it on a daily basis and keep it on my homescreen... boy does it stand out next to Billings and Yelp.
It'd be cool if the App store showed the high-res icons wherever they were applicable - app creators should know that there's a lot of us more inclined to by retina native apps right now... I imagine that once the iPhone 4 really hits the masses, developers will start seeing the incentive to update their apps.