Okay, I'm pretty sure I have all of the IM2 figures that are out right now.
IM Mark I
IM Mark II
IM Mark III
Deep Dive Armor
Power Assault Armor
1st appearance IM
IM (Classic Red/Yellow)
Stealth IM (Same sculpt as above but now in a deep blue/purple-ish deco)
IM-Juggernaut Upgrade (Same as Mark VI but better articulated and paint app is a little different-more gold)
IM-Negative Zone Upgrade (Same as Mark VI but better articulated and paint app is a little different-sap gold for silver instead)
And finally the IM car with IM Mark VI
Here's a link to reference each currently available IM2 figure: http://www.advancediron.org/forums/index.php/topic,3348.0.html
A note about the Deluxe and IM Car figure. These are all the same sculpt. However the deluxe figures have decidedly better articulation. If you are looking to make one of these the Mark VI armor for your collection go with the "Juggernaut" version. The IM from the race car set has very basic articulation. (Head, shoulders, hip ONLY) As well the plastic for the race car IM figure is softer. This figure is hard to stand straight and with the lack of articulation it's near impossible to correct it.
It clearly was made to fit inside the car as its legs are so tight to the body.
Unless you REALLY want the race car (which I did), I suggest passing on this set.
The deluxe figures are decent, though I do not think they are worth the $15 price tag. Since the regular figs are $7, these deluxe shouldn't have been more than $12 for what you get. The "Negative Zone" armor IM is cool for the different deco, but the large accessory that goes over the armor is very wonky. It's this huge chest missile launcher that just doesn't look good at all. Though this set does include snap on forearm armor than differentiates this figure from the other two Mark VI designs. So it looks different enough.
Since I'm a big IM fan, I was compelled to buy each version. If you're a casual fan, you might want to pass on the deluxe figures as well, or risk buyers remorse.
Other than those three, I'm VERY happy with the basic carded figures. Well made, great articulation and paint app and all for a decent price. I think this line will be a success.
Personally for me, I'm excited because I've wanted to build an IM hall of armor diorama for sometime and just didn't have enough IM figures to do it. This series had made that possible and I greatly look forward to finally making this dio happen.