From Young Magazine‘s website comes the news that the XXXHOLiC artbook will finally be released at the end of January, 2013:

160点以上の極彩イラストを完全収録した
『xxxHOLiC』美麗原画集は2013年1月下旬発売予定!!

The artbook will have a total of 160 illustrations.

In other news, CLAMP-NET.COM has the updated schedules for Drug & Drop and GATE 7 — they are both back in November.

– Next scheduled chapters (red means new):

09/04 – Young Ace #10 – Break (on sale).
10/04 – Young Ace #11 – Break.
11/04 – Young Ace #12 – Chapter 11.

– Next scheduled chapters (red means new):

09/04 – Jump SQ #10 – Break (on sale).
10/04 – Jump SQ #11 – Break.
11/04 – Jump SQ #12 – Chapter 19.

UPDATE: CLAMP drew Joylene Kujo for the JoJo’s Bizzare Adventure 25th Anniversary Book, check it out! Thank you drakonika for the info!