I hope admiral Thrawn will feature in the movie. And for the rest I hope it'll have a nice story, with lots of humor and heroism.
As cool as it would be, I'd rather them not have Admiral Thrawn actually. They're GOING to screw it up and the thought of having my impression of Thrawn...mismanaged...is not an appealing prospect.
That said, if JJ Abrams wants to promise the style of 4,5,6 in 7,8,9 INSTEAD of the crap that was 1,2,3....then by all means, Thrawn away!