Dont go with any preconceptions and have a great time. It may be the biggest VW 'themed' event in the UK but it isnt the biggest VW event. Lots of cars, transits etc will be there. In general camping lots of noise, lots of loud music and some instances of unsociable behaviour.
Lots of very cool cars though, some good drag racing, various traders and a good chance to have a good laugh with lots going on.
Bad weather at the Pod is bad news, but you cant plan or blame anyone for that. Im going, Ive been going pretty much since '91. Its no way the best event of the year (after EBI thats a tall order!) but it'll be fun, Im sure.