Right now the answer seems to be no. Which doesn't mean it won't happen, but there's been no mention or hint of the Empire getting capital ships. The issue is a matter of scale.
The
CR-90 Corellian Corvette is 150m long. A Imperial Star Destroyer is 1,600m long.
The
CR-90 model that
FFG is producing is about 11in long at 1/300 scale
IIRC. To make a ISD at that scale, it would be around 20 feet long, which is a big too big for most peoples gaming table.
They could make the ISD a different scale, but at that point you really lose the impact of such a ship... Myself I don't think I'd bother buying a 18 inch long ISD, because the scale would just be too far off.
There are some ships in the
EU that they could produce, ships that are closer in size to the
CR-90, but I don't know how well they'd sell.