Keisuke Toyoshima will be the director.
Shota Sometani has been cast as Watanuki.
Anne has been cast as Yuuko.
WOWOW's xxxHolic drama website with a short comment from CLAMP.
Comments by the cast and more info can be found at mantan-web
ETA: CLAMP-NET's news
Surprising and wonderful news!!!...I am guessing that that is the xxxHolic news in CLAMP Pia.