The provisional 2013 BTCC calendar is out, no major changes:
1. Sat 30-Sun 31 March, Brands Hatch Indy
2. Sat 20-Sun 21 April, Donington Park
3. Sat 4-Sun 5 May, Thruxton
4. Sat 8-Sun 9 June, Oulton Park
5. Sat 22-Sun 23 June, Croft
6. Sat 3-Sun 4 August, Snetterton
7. Sat 24-Sun 25 August, Knockhill
8. Sat 14-Sun 15 September, Rockingham
9. Sat 28-Sun 29 September, Silverstone
10. Sat 12-Sun 13 October, Brands Hatch Grand Prix
http://www.btcc.net/html/generalnews_detail.php?id=3127&month=0&year=2012&form=&searchterm=