By removing the cover glass Apple reduces the number of reflections and thus glare, however it’s important to point out that this still isn’t a matte display. I’ve never been particularly bothered by glossy screens so I’m really the wrong person to ask whether or not the reduction in reflections makes it usable. Compared to my matte MacBook Pro, the Retina Display is obviously more glossy but at the same time remarkably close.
Update (2012-06-13): iFixit has a teardown.
…we ran CPUTest for 12 minutes to see just how loud and hot we could get the machine. There’s good news and bad news: while the fan was surprisingly quiet — even in an apartment with closed windows and some light traffic and rain outside, I could barely hear it — the heat was in the ballpark of what we’d expect from our personal 2011 MacBook Pro. Which is to say, hot — particularly the metal rim around the ‘U’ key, which is about where the processor rests internally. It's hard to touch for more than a few seconds.