Only the stuff from 2380 onward. No reason that should affect TOS, say. And conceivably pre-
Nemesis novel continuity could still be referenced in new books, at least as long as it doesn't get contradicted by new shows/episodes.
Hmm, I wonder if the whistle is because you have another post-TMP novel planned or that you sneaked a post-TMP novel by the PTB's (though admittedly that'd probably be hard to do I would think). I'd love to think there might possibly be future movie era books out there (esp. post-TFF era novels---I know, beating a dead horse here but I can't help myself

).
There were a few little tidbits in McCormack's Picard novel that could be considered consistent with the existing novel continuity. Worf being Picard's first officer at the start (before being promoted to Captain), and some of the Cardassian references seemed consistent with the existing novel continuity (and some of that was even post-Destiny). But so much happened after 2380 in the novel continuity that probably 90% of the continuity is overwritten by Picard. But someone else can do what McCormack did, and maybe will do with future Picard novels. Make little references to some prior novel tidbits. It's a nice little touch I think.
It's a bit disconcerting for me that for the first time in my life there are no DS9 novels planned.
Extra annoying that a contract renegotiation robbed us of a year of books, as well; it ate a lot of the time that series could have been wrapped up if people saw the writing on the wall and that the new series coming out meant the death of the existing book lines.
Yeah, everything just halted. And now that everything is in trade format that probably makes it less likely we'll ever see novels based on the older spin-offs at this point. There probably isn't much of a market for a $16 DS9, Voyager or Enterprise book at this point. We're probably fortunate the PTB's didn't decide to abandon the last Voyager book altogether.
The only outside possibility I could see is using e-books to continue the older relaunches. It's interesting there have been no e-book only releases since the books started back up. But of course S&S & CBS would have to be willing to allow stories that may not be consistent with current canon (except for Enterprise) and you'd have to have authors willing to write those.
It's certainly disappointing that the DS9 line just came to an abrupt end; seemed like they were building up to something they won't be able to finish. VOY also still had some room to explore, but thankfully there's at least enough notice that hopefully Beyer will be able to tie things up in decent shape.
Yeah, and even David Mack's last TNG novel at least ended in a sort of finale--with the crew continuing it's mission of exploration and it ended on a positive note I thought. Perhaps he thought there was a possibility that might be the last TNG novel (at least in the relaunches) and figured he'd give it that 'feel'.
And Beyer will obviously will probably close out Voyager in some fashion.
I'd love to see one final DS9 novel to tie up the major loose ends there. DS9 arguably started the whole relaunch idea to begin with, it almost seems right that DS9 should be able to close it out.