RPF=Ritch Pixel Format
Looks like Dstorm's site has listed some of the new features of the next rev of Lightwave.
Since the cat's out of the bag here's some of what
DStorm listed on their japanese site.
Comments per object/item (modal window)
Motion Mixer 2.0
OpenGL improvements including motion blur previews
improved Caustics quality
Preview Render size switch (320x240/640x480)
RPF (Ritch Pixel Format) Exporter (for AFX. Combustion, DF etc
Beyond the listing of these features I have no other info regarding the who,what,where and when of the 7.3 rev.