Only five weeks to go?

yep. Show started around first week of June, so nearly 3 months sounds right.

Looks like there is a seamless join between the two:

http://bigbrother.tellymix.co.uk/2010/news/13500-best-housemates-to-return-in-shocking-end-of-series-twist.html#more-13500

Presumably we can start all over again then?

Winner just becomes a 3.0 shot in the allstars when they are added to the market ;-)