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If it's not over maybe they will announce a fighter at the very end.
3-4 days I believe, with tomorrow being the last day.
Sunday the 23rd is the last day. The thing is, though, it's currently 9:15am Sunday morning in Japan right now. So if we don't hear anything in the next 12 hours or so then it'll be true that there's no character reveals at TGS.
If nothing gets revealed on Sunday, there's always Eurogamer, which is not too far away. It starts on Wednesday or Thursday depending on where you live.
Eurogamer is actually this thursday, thats sweet, so if they dont unveil any characters at tgs (i hope they do!) then hopefully they do at eurogamer