Personally, I think they've progressed to the point where his classic or neo classic armors would now be plausible. Yes, I mean the more spandex look. Here's the thing, in the comics those were early on due to ease of drawing and it was only later you got stuff like the granov armors. But if you think about it those early armors would have needed to be far more advanced than the later ones to even begin to make them plausible. Essentially, those early ones move like cloth or spandex but protect like armor. They're made of billions of microscopic armor fragments all held together via magnetic beams to create the illusion of something as pliable as cloth or spandex. That concept is way more advanced than anything we've seen in the movies so far. I think they now are at a place where they could get away with it. Then you could get a suitcase armor even closer to the comics version as it could all be packed into such a small space.
He'll find out the summonable aspect is part of the problem why his armor sucked so hard in IM3 and go back to the older way more stable and durable ones that don't idiotically jump on him in pieces. I don't know what they'll do honestly but I really hated that armor.
I loved IM enjoyed IM2 but they'll need to prove themselves before I'll see an IM4. Even all the armor time we got was so horrible and frankly lame.