Yes, I am as amazed as you about this. I mean, who would have figured that after IE6 and IE7 we would get an IE8? Yes, I am being sarcastic.
Of course we can only hope they will finally ditch their proprietary muck and start supporting CSS 2.1 better. Heck, maybe we can even see some MathML support. Because in related and definitely more exciting news Opera’s 9.5 beta gained MathML support. It is not fully implemented yet, but they’re actively asking people to provide results. I am secretly wishing for a web developer uprising that will enforce websites using standards and limit the workaround hacks.