Yea Blizzard games always are very good on the requirements. Every game of theirs that I've played at release I never had a top notch PC for and it ran/looked great for me.
I'm ecstatic over this announcement. I was a huge fan of the orginal and played it for years after it's initial relase. I've been wanting to get serious into a new RTS and the current lineup is just a bunch of EA junk, and I thought AoE 3 was a bit disappointing (I don't know but I just couldn't get into it). Can't wait for this to be out, hopfuly it won't be more than a year from now.