Last, a new form of advanced power armor. The next fallout, assuming its still set in the future, should have a new and an advanced/hybrid suit of power armor. It would be years and years past the last Fallouts and technology only ever advances upon itself. So why not have a new and better form of power armor? Perhaps call it T-52A Prototype.
Uh, don't know if you realize this, but technology ceased for a good while, and still isn't up to the standards it was in the pre-war era. When the bombs dropped, T-51b, was the pinnacle of Power Armor development. Afterwards, when the Enclave got situated, they still had the technology and knowledge of how to create better Power Armor. No other faction can produce Power Armor, not even the Brotherhood. And the NCR, by the way their Heavy Troopers are, don't have the knowledge that the Enclave and Brotherhood have, on working an actual operating suit with all the gizmos that go into it.
So basically, no Power Armor improvements, just what's left.