Hmmmm, check out this:
http://www.starwars.com/video/view/001247.html
It is the WonderCon Season 4 Clone Wars preview. Shows you a bit more than the first one we saw. You see a little more of those ships that we thought might be Headhunters, now that we can see them a little clearer they look more like ARC-170s to be honest. They only have one engine either side of the hull rather than the 4 in total that the Z-95s should have (unless you go with Brand-X's redesign, which given the choice I would do. Wouldn't that be the ultimate coup? To have one of your redesigns taken on as canon?
). That said, the hull shape doesn't look quite right for an ARC-170, with a round structure just behind the cockpit that is quite reminiscent of the original Headhunter design. Also the nose doesn't look quite right, but the engines and wings scream out ARC-170. Perhaps it is some customised version of the fighter for some special type of duty or something? The jury's still out on this one I think.
[EDIT:]
Heh, now I've gone back to the original trailer and froze frame on that cockpit shot and hump behind it is definitely looking more Z-95 like, it is pretty much unmistakable, but it looks like they've made design decisions to make it more in keeping with the ARC-170, there are even elements of the cockpit design which look a little like that of the V-Wing. If it is meant to be a Headhunter it is funny how they've made changes almost indentical to those that Brand-X made with his recent redesign of the ship, it is almost uncanny, but there are things that he's got rid of such as that aforementioned hump that are very much visible here, but the twin engine change is a quite distinctive design decision made in both cases here. I'm sure Brand-X will be quite chuffed to bits if the definitive model of the Headhunter becomes a design so close to his redesign. Know I would be.

In other areas it is all looking rather wet, some more sub aquatic action, Gungans, Mon Calamari, Quarren, Kit Fisto, and some new Jedi from the same species as Jettster Dexter from Episode II (a Besalisk) posing in the rain, so yes the theme of the season appears to be fairly damp.
Oh, and something else which we saw briefly in the first trailer which were a squad of fairly spindly crystaline looking curvy fighters (seen chasing the ARC-170/Z-95s) These are a new one on me, possibly EU in origin? Look worryingly like the design for the Andromeda Ascendant, but lets not go there.
