i based my opinion after looking at the alpha gameplay of C3. of course there will be improvement but it won't look much different than C2. also from the gameplay video the nanosuit are still pretty much the same as nanosuit 2 used in C2. the nanosuit used in C1 are very different.
this is not related but i find it a bit interesting about the nanosuit. going from C1 to C2 the nanosuit have drastic change to it. the gap between the two event is around 3 years. but in C3 the story takes place around 25 years after the second game and the nanosuit barely or not change at all?