This might be stupid but I found this on twitter yesterday.
@iroll4
"@j_smedley Blizzard and Valve flagships support OpenGL and thus alternatives to Win8; why not SOE? Thanks, and looking forward to PS2!! "
@J_smedley -(SOE president)
"@iroll4 stay tuned
"
I might be out on deep water, but this exchange could be a hint at support of linux.
It could also just be wishful thinking from me.