Not convinced that this is actually going ahead. Will believe it when I see it.
First, there's nothing on amazon.co.uk and they are usually first at taking advanced orders, plus there is nothing on the Waterstones site about advanced orders or an impending re-release either.
Second, I was at Harper Collins/Thorsons recently talking with the people who originally published it and we had a lengthy chat about TMA and no one mentioned that it was going to be re-published.
Sorry to out a downer on it, but don't hold your breath, but then again I could be wrong - wouldn't be the first time!