As to when, nothing is set in stone at this point but it is abolutely in the works. That said, we do see Linux as a priority and are working on our strategy at the moment to deliver full management of SEP for Linux in the future.
I suspect thats because for most customers, the Macs are in use by the big guys in the company, CIO, CTO, etc. Put simply, its a matter of priorities and where our customer base tells us we should focus - most customers we asked in the last couple of years said 'Mac is more important to us' so we spent time and focused on bringing the Mac client into the SEPM.
