We'll see preliminary models for two Imperial huge ships at GenCon, with the official announcement shortly thereafter. They'll be slated for Q4 2014. There will be a Vigil-class Star Destroyer (3 epic points) and an IPV-1 System Patrol Craft (2 epic points).
A month later, we'll get an official announcement on Wave 5, slated for Q1 2015. It'll have the YT-2400, IG-2000, StarViper and R-41 Starchaser.
So sayeth Soothsayer Danthrax.
I'd prefer the Nebulon-B Frigate at 5 and the Mesens Corporation SCT Scout Craft at 1. Although that is just me furiously wishlisting.
That's the thing about the Corvette (and the Nebulon B) when it comes to Epic scale ships; it only takes an official cards pack to make them usable by EITHER faction...