Looks like it is mainly an attempt to make a 32 that holds more rounds than a same-size 9 mm and outperforms a 380 ACP while approaching the performance of the 9 mm. The results suggest it accomplishes that. It operates at a higher pressure than the 9 mm, so it's not like they are getting something for nothing. It's got some similarities to 327 Federal in that regard. But the momentum is still only 60% that of Federal's 45 Auto HST loads. No stopping power formula I am aware of predicts stopping effects well for all chamberings, but when two loads have the same muzzle energy but different momentum (e.g., 45 v. 9 mm military ball), then, IMHO, the bigger momentum provides an edge. In this case, it appears to be a large edge.
How that greater momentum is realized in the HST ammunition may be seen if you multiply the area of the expanded bullet by its penetration depth to produce damage volume. To be fair, I will point out I am not subtracting the gaps between the expanded petals here, as Federal does not do in trying to copy the FBI test procedure; I am assuming similar proportions, though. When you do that, the 45 HST has about 2.5 times the area of the new 30 Super Carry, and they both penetrate gelatin 15.5". This means the 45 produces about 2.5 times more damaged tissue volume than the 30 Carry.
So, while it's an interesting concept, since it appears I would need 5 hits with the 30 Super Carry to produce about the same tissue damage as is produced by two hits with the 45, I am sticking with the 45 for now.