Digital Set

Hello everyone this is my first post. I don't own any scalextric at the moment, but I have got the digital complete set coming for christmas. I did think about buying the GT Interactive set and getting the digital conversion kit, but decided against it.

I wanted to find out when the Opel Astra V8 DTM & Mini Cooper 'S' cars are coming out, does anyone know?

Also what would be the most cost effective way to expand the track?

Any help would be much appreciated.