I phoned Leema today and they were very friendly and informative.
The Tucana 2 is available now and has completely new technology which comes from the design of the Reference system. The aim was to provide more "air, detail and speed" to the sound. No real increase to the power, the changes were all about the presentation.
The Antila 2 is also available now and the old version is upgradeable.
Corvus and Hydra are not planned to be updated at present but probably will be late next year with the Hydra possibly being "mono-blocable".