As previously mentioned, there is no SEP for Linux, only SAV. And it's true that there is no central management for Linux; you can point them to a LUA server for updates and manage them in a manner of speaking by generating a GRC.dat for them using ConfigEd tool. However, there is no management console in which these clients will appear.
Title: 'Management of Symantec AntiVirus (SAV) for Linux'
http://service1.symantec.com/SUPPORT/ent-security.nsf/docid/2007100513224548
As I understand SEP for Linux is on the roadmap, but my prediction is that it will be a lot like Macs with regard to content delivery (i.e. not through the heartbeat process, but via LiveUpdate), simply because Linux boxes use Java LiveUpdate as well.
sandra