Okay, hopefully this might shed light on things. If you watch the original Clone Wars series, you will notice that those Republic gunships also lacked the side bubble turrets. If the new series follows suit (which it probably will, since the RGS's in the trailer don't have them either), then it would make sense that the turrets will be missing for the set, as it is based on the series, and not the films.
In actuality, I am a huge fan of this version. I have been waiting for a Plo Koon minifigure, since he is my favorite Jedi, but I hope it is a molded head, rather than a printed face + hood cop out, but even that I would be still be okay with. Shaak Ti is also exciting, too. The printing on the second cockpit is something that should have been done the first time, and it is an easy fix I'm glad they didn't miss again. The back indeed looks like the possible inclusion of a speederbike. I also like the bubble turrets on the wings, how they are whole, as opposed to the half ones before. The Salacious Crumb graphic is really cool, and I don't necessarily think it has any relevance rather than a homage to pinups in WWII, judging by the kills marker. It would be cool if the Shark mouth is also an option, though it does seem a little too recessed to fit as well as we might like. The compartments on the sides are now thankfully locking, instead of the rather freemoving ones in the first set, and the stickers are better proportioned, too. The one thing that kind've sticks out to me is the rather long size of the laser cannons on the nose, though this is an easy fix, and once again, I'm really happy that they utilized the ball turrets for it. Looks like you can actually point them both forward, too, instead of the perpetually splayed ones from the first rendition.
A huge improvement, and I am definitely looking forward to it!