According to the official website, episode 1 of “Suzumiya Haruhi-chan no Yuuutsu” and “Nyoro-n Churuya-san” will be aired on Youtube Kadokawa Channel on Feb 13th at 10pm JST (5am PST). They will upload a new episode once a week, but the dates and time of the updates may be irregular due to the fancy of Danchou Suzumiya Haruhi.
OP song “Imamade no Arasuji” (‘synopsis of the previous episodes’)
Lyric: Hata Aki (“Hare Hare Yukai”)
Composition: Kousaki Satoru (“God knows…”)
Singers: SOS-dan (Hirano Aya, Sugita Tomokazu, Goto Yuko, Ono Daisuke, Chihara Minori)
Source: SOS-dan Official Website
New information of “The Melancholy of Haruhi Suzumiya 2″ will be announced in the March issue of Newtype magazine to be released in February (probably 9th or 10th). The preview of the next issue says “If you want the info of the new Haruhi anime, read the March issue of NewType. That’s all. (This time, we mean the bigger Haruhi.)”
Source: Scan of Newtype Feb issue
