DodgyPutter: What I wondered was do you (both) think WGT will use the VAC system?
That's the big question -- will WGT run on a VAC-Secured server? That's a question only WGT can answer.
Another question is, what exactly would be considered a cheat? From the link that Jay provided:
Any third-party modifications to a game designed to give one player an advantage over another is classified as a cheat or hack and will trigger a VAC ban. This includes modifications to a game's core executable files and dynamic link libraries.
But what about other things, like on-screen shot calculators, rulers, wind direction aids, etc.? Again, from the VAC link:
Use caution when installing any game modifications like scripts or custom skins, and only download custom content from trusted sources.
I guess it would all boil down to what WGT considers a cheat and what they don't.