A scroll will always work if your account has been inactive for 90 days.
Question: Why haven't you just tried sending a scroll?
I havent tried because last year i quit for about 6 months as well my friend sent me a scroll and it didnt work.
I dont wanna try again incase you need to be inactive for 1year or something so im holding out lol..
i usually just play for about 2-3 months get all my gear, get bored and quit until i feel like playing again
I wish if it had to be long they'd make it a year. I wanted to get a free PvE server transfer to try out MoP. But the cost to try it isn't worth it and leveling without flying on PvP server even less fun this late in the game.... why get free trial if I'll just be camped the whole time?
Maybe they will update it sometime during this patch cycle.... before new expac.