What do you expect, I think it's personally a bit much to ask that Project Soul just discard everything they brought to the create a soul table and just make new last minute content. Most of the stuff is old yeah, but that's been the case since SC4, they always reuse most of the older items, but they do include new items as well such as that new race select feature which I'm liking. Plus they didn't really have to change much graphics wise for SC6 since iirc people did claim that SC5 looked even better than some current gen games which i can kinda see.
There will be new stuff, they're just not promoting it now kinda like SC5 did, they had a ton of new content but a good portion had to be unlocked which adds replay value to the game if stuff is unlocked in story mode. Plus we don't really know the budget that SC6 had to work with since T7 still is the main dog in the race so we should be thankful that theres even a SC6 at all, especially with all the content it'll have.