I heard datastream was a hoax, just like Enron. So, that means it's unlikely that they're coming back. Which means TK is also unlikely to come back (unless one of the big guys there have backups of the database or somethin).
Disclaimer: Any sarcasm in my posts will not be mentioned as that would ruin the purpose. It is assumed that the reader is intelligent enough to tell the difference between what is sarcasm and what is not.