It's probably unrealistic to expect this awesome new display, a quad core processor, double RAM, etc. all in iPad 3 due to costs. If the new display costs substantially more than the current one, Apple will have to find savings elsewhere to maintain the current pricing and healthy margins.
I think most customers will far happier with the retina display than more RAM and a faster processor this year. But you aren't happy, wait for the iPad 3S next year.