I'm not really worried about the use of an old engine. I'm sure that the engine is heavily modified, and lets face it, apart from the terrain levels sof2 maps are blocks as well. No offense meant here, that's how reallife stuff looks.
I'm very interested in seeing where this is going, I've never been a real counterstrike fan, I was more of a quaker. Sof2 changed my thought on that (great gameplay it has) and I'm definetely going to try that one.