I think both series have come to yet another one of those famous CLAMP hiatus's.
A proper sequal to Cardcaptor Sakura may be in the works at some point though. Watanuki can now move about, and may either join the cast of Tsubasa, or join the cast of CCS. Either way, this is a good thing. Maru, Moro and the black Mokona are not at the shop anymore, meaning that they too can move about, or their lives have come to an end. Either way, however you look at it, the story of the magical shop is over. All that matters is that an egg that Dōmeki's family tree is in possesion of, is ready to erase Watanuki's memory at some point. Time is of no importance to the Tsubasa gang. The next time they visit the shop might be when Watanuki decides to join in their adventure.
I cant really remember why Tsubasa, Fai, Kurogane and the white Mokona go off on more travels, i may have to read that ending yet again :/