Retina Macs before summer?

I believe retina Macs will be announced before summer. Here’s why: in summer, OS X Mountain Lion will get released, but substantial work on HiDPI support has just been done for 10.7.3. Why the rush? Summer is too late, I guess. I won’t be surprised to see the new Macs announced in March along the new iPad. It’s all about displays, so it would make sense.