It is strange that there are new rifle cartridges coming out all the time along with new rifles to fire them, but nothing new in shotguns really since the late 80's when the 3.5" 12 gauge was introduced.
I can argue there hasn't been anything new ballistically in rifle cartridges for a long, long time. There are short magnums, there are one off Beowulf/SPC/whatever stuff for the AR platform to attempt to make a serious gun out of one, but there's nothing really new in hunting rifles ballistically. Most of the stuff they bring out, latest and greatest and most up to datest, is for sales. I mean, if everyone was content with their .30-06, the manufacturers would have to rely on the president for gun sales (he's doing a pretty good job of that). Shotguns, well, shotgun ballistics ain't that complicated and there's really no other way to do it than how it's been done. The 3.5" 12 was an answer to the steel shot mandates for goose hunting, buy this 12 and you won't have to go buy an expensive 10.
10 gauge is out there. It's not going away, but it IS a niche. Most people just don't need or want that much power and shoulder pain.
Well, the 10 is better and, BTW, kicks less than the 12 3.5" because the guns tend to be 9 lbs or more. I've put a box and a half through a 10 without TOO much shoulder soreness the next day. Hell, there's always SOME soreness, even with the 2 3/4" 12, if you shoot enough. But, I'll admit, I'd be hard pressed to spend 600 bucks on a BPS, that's why I got an H&R 10 gauge. No real need for a repeater, more fun with a single shot, anyway.
I do have a new to me 535 Mossberg now, but I need to pattern it with 3.5" T shot. That 10 shoots over 90 percent 40 yards, 30" circle. Best pattern I've ever shot out of a shotgun, truly amazed me, and it's KILLER on high flying geese. If I hunted geese more than I do, I'd get a BPS. My primary quarry is ducks, though, and 12 2 3/4" does fine on the biggest ducks over decoys. Snow geese can be up there on clear days even over decoys. They ain't stupid by the time they get down here.