I think Jeck hit the nail on the head. It coincides with the annual server renewal. Bioware made the judgment that APAC servers are going to die eventually anyway, so rather than leaving it hanging and then give out transfers later, decided to just close it down to save costs.
The thing is tho, Unrestricted server transfers should be here now. Shut it down or whatever but Unrestricted Server Transfers should be here by now. fyi, APAC doesn't concern me but I feel for them. Offering Unrestricted Server Transfers instead of continuing the restricted one would've been a better choice. Then look at APAC's population again to see what they should do. They could've merged all three servers and Offer Unrestricted Server Transfers which will keep as many APAC people happy as well as Universally, keeping the players playing the game happy.