I know, many of us dream and drool thinking about a Sail Barge being made, an AT-TE or even a Turbo Tank. But the big H is more likely to make rainbow Yodas than these vehicles.
So, being "realistic" what do you want to see made, that is all new; and in a realistic price point? You could use vintage molds too where applicable.
I'd like to see the following, thought I doubt any will be made this year.
TPM - Federation MTT (could make this about the size of the Sandcrawler)
AOTC - Homing Spider Droid
ROTS - Tank Droid
ANH - Imperial Landing Craft (seen on Tatooine Special Edition)
ESB - Cloud Car
ROTJ - ?
Notice all the Separtist stuff missing from the prequel vehicles?