What counts as substantial? The return of a Battle Frontier? More Alola Forms? Potentially spoileriffic material concerning Ultra Space? ~_~
When B2/W2 were announced does the fact they took place in Unova count as copy paste? When Dawn and Lucas got new outfits when Platinum came about was that pointless? If we don't actually know very much concerning when these games take place, if they're sequels or not... how's it simply laziness when there might be a purpose behind it?
To be fair, when you compare the information that we know about USUM with the information we knew about B2W2 before it came out there is a significant difference. (I realize you're not saying we didn't get a lot of info, sorry I'm just using you because I really wanted to post this somewhere :p)
B2W2: character redesign (or new characters depending on what you count them as), an ice-covered map, 6 new forms, a new feature that doesn't have an affect on story and is for fun (Movies), new Gym Leaders, new towns and therefore new areas (Aspertia, Marlon's town, the junkyard south of the Poison city was also shown), version area differences showcased, old areas shown with new designs, new roles for old characters (Cheren and Bianca), new characters (Colress, Professor Burnet, Hugh), a redesign for the evil team, confirmation that new Pokemon are being added to the Unova Pokedex (arguably more of a big deal in B2W2 because the Pokedex only included Unova Pokemon before), changes to old features (Global Link), new extra feature (Dream Radar, Join Avenue, medals), some spoilers about the return of older characters (Ghetsis and N)
USUM: character redesign, new map but there aren't many huge glaring differences, 3 new forms, a new feature that doesn't have an affect on story and is for fun (Photo Club), a new Z-move
In fact, the information we've been getting is more like the stuff we got for Platinum: character redesigns, a new area explicitly shown/stated to exist (Distortion World and Battle Frontier) and others hinted at, 7 new forms, random features (Poffin changes, Battle Recording, random Wi-Fi games), new sprite revamps, new characters (Looker and Charon), expansion of Sinnoh Dex, throughout this time screenshots were also being leaked kinda frequently
But come on, it's 2017; it's not 2008 anymore. Now we still are a while away from the game and a lot of the B2W2 information was revealed up until the last minute, there is still a lot less information so far. It's not fair to call out people that are disappointed about the lack of information and say "well what
did you want?" when we actually
did have a lot more information before that could be considered hype-worthy (though I'm sure Alexander would just say most of it is pointless); just go check Serebii's archives from early 2012 (B2W2) and 2008 (Platinum).