Since I have no better thing to do in the office I decided to recompile and digest Vergeben's statement heheh (he already reiterated his points a few pages back, I'm adding my own perspectives)
-he knows 7 characters
-char #1 is Kilik with staff moveset, he mentioned him having a new rival, possibly one of the new characters.
-2&3 are "obvious" veterans. people's standards may vary, but who I consider obvious are: mitsu, sieg/NM (SC poster boys) and ivy(de facto sex symbol), taki is out of the equation because he said the char is always playable since their introduction. Sieg and nightmare's appearance and who's in what is... debatable and not worth getting too deep for this mere speculation . Since he said they're male and female, and introduced in different games, my bet would be mr. roogie(SE) and ivy(SC). but if all 5 turned out to be in the final roster, I wouldn't be surprised, these are just 2 veterans that Vergeben is certain of about their existence.
-4&5 are brand new characters with brand new movesets (at least for one of them). Vergeben always mentions blade based moveset for one. He said Kilik would have a "new rival", I don't know on what capacity does he meant by rival, but I interpreted that statement as "another character that has long range weapon". But I guess you could say Maxi is Kilik's rival/best bud so it might not be about weapons after all. He said the devs are finally understanding what players want out of the characters, my interpretation is: it will be a gruff battle hardened manly man or a curvy mature lady for appearance, and the moveset will be more grounded towards historical weapons instead of anime mumbo jumbo.
-#6 is the alleged FE character. Vergeben did try to drop clues by bolding some names, but I'm really not familiar with the game.
-#7 is link, but Vergeben mentioned his original source on this is not 100% credible
-about style changing - he mentioned the keyword "to a certain extent [exists/is implemented]" over and over, I still can't pinpoint on what this really is. programmatically, mid-match style change would potentially the most problematic, so if we scratch that, MK-style style select is still in the cards I guess but IMO still would be a pretty huge scope. My wild guess would be edge master mode weapon collection is back, and some if not all the special weapons will modify your movelist.
/end speculation