While compiling a comprehensive list of all Crossover TFs over the last couple of days, I found this at the Entertainment Earth online wholesaler.

Thire/Republic Attack Cruiser.

It's part of wave 5 (wave 4 has just been released in America), and is the only new mould in that wave - but this is the first I've heard of it.
No pics, and I have no other sources to know what it will look like.
(looks like it is part of the Clone Wars series of characters - but a Republic Attack Cruiser should look nice, as I've been wanting them to do a SWTF Imperial Star Destroyer, so this is the next best thing)