Back on topic,
I am curious if in the "mainverse" that Marcus was actually an Admiral or the events of the U.S.S. Kelvin
and/or the destruction of Vulcan rocketed him into the position. In the "mainstream" universe I don't know if we ever got any information about Carol Marcus' father and David's grandfather.
Likewise, I'm curious about his version of Section 31 as well. Is it that large (having its own shipyards and massive facilities) or is that a result of Vulcan's destruction resulting in a complete and utter change in the direction of Starfleet at a fundamental level? These are all questions I'd love to see answered.
While the two universes have split, knowing how the two universes are changing and how they differ would be interesting. Sadly, I don't think anyone is going to publish a book about how they differ on specific points.
I'm also curious if we'll be seeing mainstream Scotty having invented transwarp beaming (obviously later in life than 2009 Star Trek universe). It'd be quite interesting to see its incorporation into the novelverse, though I wouldn't be surprised if it didn't get much of a role or downplayed.
I'm also curious if Praxis exploded prematurely in this universe or if it's just in the process of melting.