That other championship is still ongoing, and has spaces. Given that we don’t often get a full amount of people racing there is clearly not the demand for one full championship, let alone a second.
For now, keep to the original series. There are already a lot of F12010 topics and as I mentioned, there is already an xbox championship, located here: http://www.f1fanatic.co.uk/forum/topic.php?id=953
