Catalyst was great. Most of the PT connections were very basic things, planet/alien names, vague references to events (like an alleged Jedi “attack” on the Chancellor/Emperor), but nothing big IIRC.
Without spoiling anything (I’m waiting for the paperback), could Thrawn fit with the original Thrawn Trilogy? I assume it wouldn’t outright contradict them, despite Canon statuses, but I guess it might.