It seems like most people have already received theirs. My sub hasn't ever lapsed since 2.0 hit. Yet I don't have my mount. I pre-ordered SB and registered immediately so I'm really not sure what the issue is.
I contacted customer support who in an impressive display of being totally helpless just posted the requirements that are listed on the mount page on Lodestone, followed by suggesting I ask on forums...
So, here is me bypassing the useless "customer support" trying to figure out what the deal is.