It is very promising that EndWar has received such good reviews from XBox 360 players (18 out of 27 people gave it 5 out of 5 stars at Amazon.com) Traditionally, RTS games play better and are more popular on PCs. So we should expect a great game here. I'm especially excited that there are 25 maps. Compare this to the Dawn of War II's mere 6 maps. Both games are due for release this month, and I have chosen to buy EndWar over DoW II.
I expect a large turnout from PC Gamers.
My only concern is that I've seen some XBox players complain about bugs which haven't been fixed yet, and I'm hoping that's because the game developers have been busy working on the PC version.