When do the other bands start getting announced? e.g. - for the other stages/tents and also for the remaining spots on the main stage if there are some.
When they do...hows the best way to find out? Will meanfiddler put it on their site straight away or should I rely on this message board?

it'll be gradual until the actual event, and the official site is usually last to be updated

Doesn't really surprise me that official site is updated last. Any rumours for the next few bands? I'm sure someone on here said Fenix Tx were playing, and AFI said in Metal Hammer a few weeks ago they were planning to do some festivals. Don't wanna speculate too much though....

well fenix tx are everywhere, supporting New Found Glory, A, their own tour, they even played feet first (a club night) the other week, plus drive-tru have said they're trying to get bands on the bill, which include, Fenix TX, NFG, Starting Line, Finch, something corperate, RX Bandits etc...

The best way to find out about other bands playing is often to look at their websites and their tour dates. It's pretty much down to the bands playing to publicise their appearrances (with the exception of the main stage acts) the site gets updates, but if you're up to date on what's going on then there won't be much new.