The Lucky Star OVA is now available for order from CDJapan:
Lucky Star OVA (Title subject to change)
The release date is the 28th of August and the price is 5800 yen (6090 yen with tax). Yasuhiro Takemoto is directing as per episodes 5 onwards of the TV series. There's no other information on CDJ, but Neowing comments "The 'Star ☆ Deadwood' is now re-emerged OVA!! TV series can depict episodes that were not realistic and time-axis in such episodes included in the original plan." (<3 babelfishing). Going to Neowing proper (The link from CDJ for some reason just brings up something inbetween now) reveals that the OVA length is 30 mins and that there will be another Lucky Channel radio drama included.
I'll add Amazon and Yes Asia links when I have them.
--edit--
fixed CDJapan link, and here's the Amazon one:
http://www.amazon.co.jp/dp/B001BA20GA/
Also added some images in the extended entry.
--edit2--
Added some more images.
CDJapan also now states it will include behind-the-scenes footage from the recording of the new radio drama. Neowing adds further that there is an 8-page colour booklet and a first press BGM CD and is now showing the runtime as 40 mins (probably including the bonus footage), the ratio as 16:9 and the audio as LPCM stereo.
--edit3--
Added some colour settei from the official site.