AFAIK Symbolics is basically a one-man operation, and the owner has been unwilling to sell the rights to Genera for any price.
As of several years ago, though, he was willing to part with a number of new-old-stock Ivory CPUs, for roughly the cost of their weight in gold. (And periodically offers Ivory machines for sale on eBay. Here's what these look like: http://www.loper-os.org/?p=2857 )
"Wish List: a knowledge-based operating system running on a MIMD parallel machine. The system should exceed the productivity of the Lisp Machine by several orders of magnitude and integrate seamlessly with a global knowledge base and with a global computational environment."
Looks like he recently registered a new company: https://opencorporates.com/companies/us_nh/872107