Now, the buzz is that the two are set to collaborate on a film. A source says, "Abhishek and Karan had a late night meeting at Karan's house earlier this week. It was a casual meeting but they are said to have discussed few projects too. So there is a possibility that they will soon collaborate for a project and might announce something."
Now was this meeting for the sequel of Dostana or for a new project. Your guess is as good as ours.