Even without official confirmation
We have known for some time that the developers at Codemasters, which is now known as Codemasters Racing Studios, wanted to do a follow-up to the highly successful GRID. The thing is that other projects just seemed to get in the way.
Despite no official confirmation from Codemasters, it is now certain that Grid 2 is in development. If you just happen to wander about in LinkedIn and look at a number of profiles for developers formerly working at Codemasters, you will come across a number of them that were working on Grid 2.
This is really all the confirmation we needed to see. Some developers that are still working there are even showing that they are working on Grid 2. We think it is now unofficially confirmed, but we are not sure when the Codies will make it official. Look for that to happen sooner rather than later.