Thanks Carloh i suspect an upgrade price rather than a full new license.
i found this info interesting: http://www.fxguide.com/featured/the-state-of-rendering-part-2/#maxwell
The next release of the product will support new volumetics, alembic, deep compositing and will see Maxwell integrated much more closely with Next Limit’s RealFlow with direct Maxwell previewing built into RealFlow. “There will be between 25 and 30 new features from volumetrics to deep compositing, it is a major release, the biggest release in our history,” explains Cañada.
my biggest wish is open cl rendering.