Re: the Ewok as a sub only companion. I just saw n Dulfy's site that Cory Butler has confirmed there will be a CC option to pay. So, confirmed as not being Sub only.
As for what they could give us....shared account bank space would be one thing.
Star Trek Online has a veteran's program to reward their subs
Rift had one as well. (Though, I understand their's has changed some post f2p