Quite unusually, Cyanide has decided to give a list of the primary problems that they are currently working on.
1st priority is the activation problem. Many of those who have bought the dvd version are asked for an activation key although these are not included with PCM10 (well, technically, they are on the disk, but never mind...), This means that they can't play the game at all. It's not a problem that we've seen much here at PCM.daily, but it's heavily debated at other forums. E.g., the Danish forum was flooded with questions like that when the game was released officially yesterday.
Other than that, Cyanide has fixed the World Championship problem (too few good riders). Whether you can benefit from the fix in an already started career depends on how far you are in your save game. The patch will also fix the crash in season mode, the Eddy Merckx-like young riders bug in career mode and the fact that no bonuses are given in time trials.
On the other hand, Cyanide says that they are unable to reproduce the run time error crash in Season Mode which happened during the creation of it - a problem that several members have mentioned here.
Lastly, they also mention that creating more 3D stages are not the top priority, although they are working on it.