This actually urked me because i know for a fact people are going to buy marie and phase 4
So i actually have to buy them early because they will be used in tournaments
tchhhhh.....
Gathering up all my strenght, I think that I will wait to get them until the definitive release by Team Ninja in a complete pack (but I was already ready to get Marie Rose next week...

).... but to get my hands on 4-5 characters in a single time will end to be definitely satsfying =)
I actually think we'll get 3 more characters, so I think we'll get Tengu, new male, and a new female.
If TN will decide to add 3 more characters, IMO they will release the charas that you said and in that order (I think that a female character, considering the priority that they have in the series, will be always the last character revealed). If the characters will be 2, then I think a guy (hoping for Tengu) and finally another female like last one.
Anyway the doubt is just if the characters will be 2 or 3.
Considering the place for the new characters in the roster, I would say 3 because there is the room for a such number of characters, more in DoA5 and DoA5U TN has always added 5 characters in a row (Akira, Rig, Sarah, Mila, Pai - Momiji, Ein, Jacky, Leon, Rachel).
But considering the current roster in the Arcade:
I can't find a logical symmethrical disposition for Phase-4 and other 3 new characters, but only for Phase-4 and other 2:
But of course this isn't a confirmation for anything: Team Ninja could also decide to use a different disposition (for example to keep the dice in the middle of the third row, and to add four characters in a fourth row under the icons of Gen Fu, Pai, Jacky and Ein) or to leave the roster not symmethrical....
Actually I just bored with "new characters coming in near future" announcements. Waiting for Marie killed me and now Phase 4... Anybody else?....Why? Cause important thing is what we will get. Brand new or fan favourites. Make it clear please! 6 MONTHS OMG time not passing...
Part of the pleasure is just the waiting and the surprise behind the characters' revelation
About the "6 months and maybe more", this is the time for having all the characters in the console. But in all this time they will continue to release singluarly them on console, so if you don't want expect for the complete pack, you will be able to get all of them (with the exception of the last one) much before.