I don't like oversized weapons and I certainly hope there are some slimmer, sleeker variants I can glamour over the big ones. Like, the one in the Elezen picture is too much for me - that barrel is as big as his head which looks comical.
But I hope first and foremost that there's variety and the designers are free to feature the full range of shapes, themes and sizes. Since the job starts at 60 and is available without MSQ requirements, that means we're going to start off with end-game HW designs (Alex, Shire, etc.), then cover all of SB levelling and end-game tiers (minus relics since new jobs are never retroactively covered), and then all 10 levels of SHB. That is a lot of room for all sorts of gunblades. Chances are everyone will find something that goes well with their character and glam.