They've already contradicted Countdown
in how Data was resurrected. I enjoyed Countdown, but I'd like to see the novels tell their own independent version of events surrounding the supernova crisis.
As for Worf, I'm afraid I'm bored of the character, so a Captain Worf series doesn't really appeal to me. And I don't see Picard leaving the Enterprise, simply for the real-life reason that it would potentially screw up the TNG brand, which is still making Pocket Books money (I assume, since they're still making them 11 years after Nemesis!)