2K has something secret to show at their Gamescom booth
2K will have a booth at Gamescom next week, which is notable as they skipped E3 all together in June. Of course, they have more stuff to promote now, namely The Bureau, NBA2K14 and WWE 2K14, all of which they will have in said booth. But there will be a fourth game or thing there as well, but 2K isn't saying what it is.
We aren't expecting a big announcement from 2K at the show, and so logic indicates the secret thing is the upcoming Bioshock Infinite DLC.