In Chapter # 204 of Xxx Holic (clamp) present in Young Magazine # 16 (On Sale Saturday) we learn that this chapter will be the last published in Young Magazine. With effect from the next chapter, the series will be published in Shounen Magazine Bessatsu.

So the series moves from a Seinen magazine to a Shonen Magazine, and the rate goes from weekly to monthly.

The resumption of the series (With Chapter # 205) will be held in Bessatsu Shonen Magazine # 07 (On sale June 9). At that time the series will be entitled to the magazine cover and color pages.
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