The game is only half-complete, I don't think it'll even be released in Japan this year.
The dates on the official site (June 30 etc) are the publication date of this week's Famitsu magazine, the one we are reading about at the very moment.
This screenshot? The person in it is Frey. I think that's her at the very beginning, just thrown off the airship, so that's why she's not in her princess attire. (EDIT: CherryRose is right, this is Lest.)
Dolce
Dolce is a real Italian name meaning "sweet""pleasant". I also think she's a gothic vampire fan rather than a real vampire. Note the bat badge on her hat. The art style of RF is subtle enough that a vampire wouldn't be wearing a bat badge!
The Famitsu article
It doesn't say anything we don't already know. So we still have no idea what happens to the protagonist we don't choose. I'm crossing fingers that he/she is still part of the story and marriageable. Of Ventuswill, I don't think they'll mention the names of the dragons in a game preview at all.
The protagonists' VA
Lest is voiced by
Uchiyama Kōki (Soul in Soul Eater, Banagher in Gundam Unicorn, Ichika in Infinite Stratos).
Frey is voiced by
Saitō Chiwa (Aika in Aria, Hitagi in Bakemonogatari, Homura in Madoka Magica).
Now, time to do my thing!
I have a small observation: they are no longer calling the bachelor(ette)s "hero(ine) candidates" so as to differentiate RF from HM. Instead, the article simply use "husband candidate""wife candidate", which is the terminology the HM games have been using.
This however doesn't seem to mean anything in particular. They are emphasizing the game as "RF 5th year anniversary", so the RF series has been firmly established as its own brand now. And romance in RF4 is definitely more important than ever, now that the game's tagline says "
Fall in love and then become stronger. Know love and then change the world."
The "love" in the first sentence is
koi, which is passionate love. The second "love" is
ai, which is a more general term of love. I suppose if you've heard of C.S. Lewis's theory of love, you can think of it as moving from eros (romantic love) to agape (universal love), stuff like that.
Rips from the official site:

