I think at this point anything marked as a Typhon Pact will probably focus on non-series specific characters or will be crossovers, and the stuff marked as a specific series will just focus on the characters from that series.
Well, no, because we've had Typhon Pact
novels that are strictly TNG or strictly Titan
It's really quite simple: a book is labeled Typhon Pact
if it is about the political alliance called the Typhon Pact or its member nations. If it's not about the Pact or its members (or at least not primarily about them), then it won't be called Typhon Pact
, any more than a book would be labeled Klingon Empire
if it weren't about Klingons. There's no special formula or code behind it; it's exactly what it says on the tin.