I'm not 100% sure but I think Tufo has discontinued the tubular clinchers though you can still find some around. And as far as tubeless, while I haven't used them, I heard a lot of them in action last year going through the turns ...
"Burp!"
Excuse me! And I had a number of friends using tubeless that gave me invaluable insight to their performance ...
"Burp!"
Excuse me, again! Must be that Stan's Burrito I had for lunch. The friends that were tubeless have now gone tubular. While tubeless seems like the thing for mtbs the low pressure demanded by cyclocross, is, well, probably too low.