I think Specialized also have a dh hub with a 9t on
Canfield are releasing one this year, and for those with good memories for shimano codes it uses a CS-HG70-s 11-26t cassette, ie. Shimano Capreo (the old folding bike groupset)
Of course the point of this is that DHers want stuff that looks cool, 9-26 gives no advantage over a 11-32 other than a tiny bit more ground clearence as your running a smaller front ring (approx 15% less teeth on the chainring for same gear ratios). The disadvantage is sourcing cassettes, new cassette tool, specialist (and its heavier) hub, only compatible with certain frames.
And that last point is important. For those wanting to buy in to the 9t idea, will the chain rub on your frame when in than gear? many frames will!