Interesting....
Full disclosure, I never actually finished the Thrawn trilogy. Got about halfway through book 2 IIRC. Last Command sits unread along with more books than I'd like to admit from the old EU, including the Hand of Thrawn duology.
I tried reading Outbound Flight after checking it out from the library almost a decade ago but never finished that either.
So my memory of Thrawn is fuzzy but this reference to artwork probably would've tipped me off as well.
Funny how they're (evidently) making reference to a character from the very first novel of the old post-Jedi EU in the very first novel of the new post-Jedi EU.
I am correct that this is the very first thing released so far to take place between episodes 6 and 7 in the new canon, yes?
Also, if this takes place the day after RotJ is there any reference made to Luke? One of the earlier Ep7 spoiler reports mentioned something about him not having been seen at all in the 30 years since Endor.
One more question, and I'm pretty sure the answer is no. If this is set immediately after RotJ and it follows a new group of characters, is there any chance the events of Truce at Bakura could still be taking place? Until your mention of a possible Thrawn reference I would've said the answer is definitely no, but now I'm starting to wonder if they're not wiping clean but simply "ignoring" some of the old timeline like Zahn first theorized.