I think a lot of people have been looking for things in the .327 mag range. That's why .32-20 is still alive.
.327 mag is a high velocity small .32 that fits somewhere between the .32 H&R and the .32-20 in terms of power and is suitable for small revolvers. Considering that .32-20 is one of those useful but obsolete rounds, and the .32 H&R is pretty mild compared to what it could be, that's a promising niche if anyone starts making small carbines and other "field" guns chambered for .327. No other round lands exactly on top of it in performance and it is well suited to a roll some people value. I would have one on my "buy" list if I could get a matched repeating carbine.
.45 GAP was pincered between the .40S&W and the .45 ACP... one offers identical performance at a lower price per round with hundreds of well respected weapons to choose from in a long case form factor (that, while longer than a 9mm, isn't so long as to make a grip frame uncomfortable), and the other does the same in a short case form factor. Between those two GAP really doesn't offer anything particularly novel. The argument comes down to perceptions of recoil and the like and that's hard sell.