According to the official website, Bandai Visual's three new OVAs were announced to be premiered at Anime Fes. VS to be held on November 27th. The fourth title hasn't been revealed yet.

Koi☆sento
Synopsis:
The story takes place in Nara city in 2710. Shin-ichi visits there on a school excursion and a white deer suddenly takes his bag away. He chases the deer and meets a mysterious girl Toto, who is running away from a gang of chasers.

Koisento official website

Staff
Director & Scenario: Morita Shuhei
Character Design: Sajiki Daisuke ("Freedom", "Kakurenbo")
CGI Director: Sato Kodai ("Freedom", "Hipira-kun")
Theme Song: Kotobuki Minako
Production Studio: Sunrise

Cast
Shin-ichi: Ono Kensho
Toto: Kotobuki Minako
White deer & Megane: Yamaguchi Kappei
Aniki: Inada Tetsu
Ototo: Koyasu Takehito

.hack//Quantum
Synopsis:
Tobias, Mary, and Sakuya challenge the impregnable "The One Shin", but they lose their way in the maze and unintentionally trap other guild members. A mysterious cat is watching their blunder. Is it another player character or NPC?

.hack//Quantum official website
Quantum PV on .hack Channel

Staff
Director: Tachibana Masaki (“Tokyo Magnitude 8.0”)
Scenario: Hamazaki Tatsuya
Character Design & Graphic Director: Hasebe Atsushi (episode graphic director of “Darker than BLACK - Ryuusei no Gemini”)
Theme Song: Nanri Yuka
Production Studio: Kinema Citrus

Cast
Sakuya: Hanazawa Kana
Tobias: Sawashiro Miyuki
Mary: Fujimura Ayumi
Hermit: Ogura Yui (official website)

Mazinkaiser SKL
Director: Kawagoe Jun (“Super Robot Taisen OG: The Animation”)
Series Composition: Hayakawa Tadashi (“Kotetsushin Jeeg”)
Character Design: Ito Takeshi (“Tactical Roar”, “Switch”)
Production Studio: Actas

Source: Anime Fes. VS