Hi mjg
Thank you for reporting this. We did learn of this a while back as OS X Lion has effectively killed off many Mac apps but were putting all our efforts into developing our HyperNext Android Creator dev system.
This weekend we created our HyperNext development setup on Lion and need to get the build process working then some testing.
I can't promise a release date but at least we are on it now and making some progress.
By the way, it won't be HyperNext V4 but just HyperNext V3 for Lion plus some bug fixes.
Malkom