We have the Obi, finally! shidouhikaru15-chan found it for us (she’s my heroine today xD):
The big letters say:
Production: PRODUCTION I.G Script: Nanase Ohkawa
The small letters say that the first OAD will be attached to Tsubasa #26, to be released in February 2009. Tsubasa #25 will be released in November 2008 and will not come with an OAD.
More information will be available soon in Shonen Magazine and in the official website of the Tsubasa OADs.
So the schedule goes like this:
Release date: November, 2008.
XXXHOLiC #14 DVD Limited Edition
Original Animation DVD “XXXHOLiC Original Episode” (tentative title) Part 1
Running time: 25 minutes.
Release date: January 16, 2009.
Tsubasa #26 DVD Limited Edition
Release date: February, 2009.
There should be more information on the back side of the obi but we couldn’t find any pictures so far, including the hypothesis that a total of 4 OADs will be released, 2 for XXXHOLiC and 2 for Tsubasa.
It’s very likely that the XXXHOLiC and Tsubasa OADs will be linked, specially if we consider that the staff has both XXXHOLiC and Tsubasa Tokyo Revelations directors working together.