I have it on good authority that there will be a 10" Subal dome in about 3 months...maybe DEMA?
For those who use the Seacam and Aquatica larger domes, what specific lenses do you really like to shoot with the superdome, what improvements do you see, any tricks, extension rings etc. that I need to know before purchasing this 'must have' piece of equipment so that I can say 'My dome's bigger than yours!'

A lot more goes into dome performance than simply diameter, but generally:

-Slightly sharper corner performance w/ 12-24
-Slightly thinner water line w/ over unders
-Higher Cost, Larger to Travel With

Underwater handling remains to be seen, but the fe2 is pretty sweet.