The plot thickens....
I have recently taken a keen liking to the Browning A5 Sweet Sixteen...as I assume many have.
I'm really between that and the A5 12....but there is something so nostalgic about 16 Gauge and it appears ammo is not as tough to come by. Not cheap, but somewhat available. I've really eyed up the 12 as well, just as that is what I'm used to shooting. I'd probably be between an A5 20 and 16 instead of the 12, but it doesn't sound like Browning even has an interest in the 20, and if anything, is putting its chips in the 16 basket.
I realize these new guns are more unlike than alike to the old Auto 5's, but we are a few decades from their heyday, and realistically things change and modernize, for better or worse. All of the guys in my hunting crew are family and quite a few years my senior (father, great uncles, second cousins, etc.). They all remember when they bought their Auto 5's brand new, and when they transitioned to 11-87s due to steel and magnum loads. When they could shoot lead they all had the Light 12s. In the long run, I might actually buy a 12 to go with the 16, who knows.