According to Bessatsu Shonen Magazine official website, CLAMP
's manga xxxHOLiC
will end serialization in the next issue to be released on February 9th.
The final 19th volume will be released on March 9th in Japan. An OVA xxxHOLiC Rou ~Adayume
will be bundled with the volume.
CLAMP will start a new series Gate 7
from February 4th in Jump Square magazine.
Source: Kodansha's Website