No information except a set of very old (still interesting, but old) snapshots of what appears to be a catalog of their products, and an admonishment to contact a person to learn more.
This is usually understood as enterprise-speak for "we don't want to give you a price, and if you have to ask, you can't afford it."
The most recent price list I got from David Schmidt @ Symbolics (2/23/10):
"Thank you for your request for information about Symbolics and our products. Our Open Genera software for HP/Compaq/DEC Alpha workstations running Tru64 Unix costs $5,000 for a single CPU license. There is an academic discount for students and teachers that brings the price down to $999. You should have a 300 mHz or greater Alpha workstation with at least 500 MB RAM, 4 MB cache and 1 GB of available disk space. Besides selling Open Genera and maintaining the installed base of Symbolics machines, we
also sell refurbished Symbolics hardware. There is no hardcopy documentation, but there is complete documentation available on the hard disk of each system."
As of a few months ago when I checked, he said they no longer sell refurb hardware, keeping the remaining stock for service contracts/warranty work/etc.
The problem is that the official version of OpenGenera still runs only on the long defunct Digital/Compaq Alpha platforms. The emulator version is (or "was" because it's not a work-in-progress) a proof-of-concept for a port to x64 Linux, hence the dependency on old versions.
lispm is referring to a new commercial emulator commissioned by the current owner of the genera intellectual property. You should contact http://www.symbolics-dks.com for more info.
I completely agree, but anyone officially affiliated with MIT has a poorly documented license to use genera and this gets something interactive in front of them. It would be really nice if there were a reasonably priced way to get a better version.