Future crossovers?

[hazurd2s0ciety.livejournal.com]

Hullo hullo all! Been lurking around for a month or so and while I was
watching R2's episode 09 I noticed something... Anyone care to humor me?



At Tian Xi's pre-wedding party, Zero showed up with Kaguya, whose last name
is apparently SUMERAGI. After taking about a minute or so to process what I just
heard, I realized that this is a CLAMP anime and that usually, all(or most) their
anime/manga are usually connected in some way. So I ask you, since Kaguya's a part
of the Sumeragi clan, you think there's any chance that there might be a crossover
episode with any of their other series?