I'd be willing to bet there won't be any further 24th century post-Countdown tales for another four or five years. It'll take that long for everybody to figure out whether Countdown "counts" or not for the licensed Trek fiction.
Umm, Countdown is licensed Trek fiction. What you're talking about is whether Pocket's fiction line will mesh with it or not. And since Pocket's main continuity is still in 2381, it's likely to be a number of years before that even becomes an issue.
As for further licensed Trek fiction from IDW Comics, it stands to reason that Countdown would be considered to "count" as far as they're concerned, so there's nothing precluding them from doing their own 24th-century followup regardless of what direction Pocket takes.
There's also the fact that the Star Trek Online RPG has already incorporated the events of Countdown into its own backstory. So it "counts" as far as that licensed fiction (if the term is applicable to a game) is concerned as well.
After a few more films in the Abramsverse, I expect Harold will be relegated to an Earth-2-like status (meaning neglected second fiddle). So adventures that progress farther into the 24th century will fall under the alternative universe category as far as Paramount Licensing is concerned. Licensing may allow them, but not bother to ensure they're consistent with each other.
CBS's licensing department (which is still responsible for all tie-ins even though Paramount produced the film) has never bothered to ensure that tie-ins were consistent with each other, only with onscreen Trek. Continuity among tie-ins (when not forbidden by Richard Arnold) has always been at the discretion of the editors and authors.
^Right. There exists a complete sequence of Nero's crew imprisoned on Rura Penthe, but Abrams cut it from the film since it threw off the pacing and was an unnecessary sidebar.
Thus explaining the 47 dead Klingon ships, I'm guessing. That was his escape and revenge?
Escape, yes. I don't know about revenge, not having seen the deleted sequence.