MMO Hub takes their first look at The Secret World, along with the rest of the GDC 2009 press. Here’s a snip on the subject of platforms.
Right now, “The Secret World” is planned for 360 and PC, and both versions will remain unique; so no playing on a PC with your 360 pals. The developers are trying to keep the games basically the same, but obviously issues of control, chat, etc. will differ. One thing that they did make clear is that, since some people will prefer to use controllers given the realtime, skill-oriented combat, the PC version will offer full Xbox 360 controller support, and settings to make it play just fine with one.
As for a PS3 or Mac version? Those are in the air until they see how other titles do with their launches on the two consoles.