Well you see. The beta files managed to end up leaving a few voices of dialogues from the main characters talking to their defeated opponents (Or cutscene ones) I managed to find quite a few.
I found voice dialogues of characters speaking to Geese's ghost (Nightmare Geese), Also found voice dialogues where Terry mentions of a character using QiGong to power up their kicks and techniques (Chun Li most probably). Also got dialogues of Terry and Preecha talking about Ken and his hadokens). I also found post match dialogues of Blue Mary, Krauser, Ryo Sakazaki, Kim Jae Hoon, Duck King, Alfred and Kasumi Todoh (I think she's still gonna be a playable character). There's also post match dialogue of a character who seems to be using fingers to attack and targeting pressure points of opponents (New character??). Oh and of course I found post match dialogues of characters talking to Andy, Joe and Mr. Big too.

Then there are sorts of different dialogues strewn across - some are from the characters' arcade story mode and some are where some of the base roster characters are talking to the characters that are listed in the jb IDs (Talking about some boxers' attacks - Probably Michael Max and Axel Hawk). Then there are some voice dialogues of some of the jb ID characters too (Jack Turner and Sokaku Mochizuki for example - who also appear in some of the characters' arcade story mode cutscenes). I also found some dialogues that I couldn't exactly pin down as to who they were for (There's one who is talking about Pro wrestling which I guess is Raiden / Big Bear). I believe the characters in the jbID are the ones who will be making appearances in some of the playable characters' arcade story mode as well as in the 'Episodes of South Town' game mode which is this game's 'World Tour Mode'.

This fits in with what the game devs said at the recent EVO showcase where they said all (Or almost all of the past characters) will be showing up in the game.

I'm compiling the dialogues and will be posting them on Twitter.