Ya i remember back at the PAX event, people said the next reveal would be the 22nd- 23rd. It wasnt anyone official, but it was just people. then all of a sudden it jumped to the 18th.
hopefully there will be some stuff revealed. We have yet to see full matches on any of the new stages, any items, or (obviously) characters. They are holding back for sure, and amazingly nothing is getting leaked as of yet.
I think that the trailer SB released for TGS was just a teaser for what will come at their panel on Saturday. I'm sure they'll go into detail on the new stages, and show off a couple new characters on them. That's my guess. I'm not sure why people are doubting that there'll be any reveals... TGS doesn't end until the 23rd. That's three more days