Hey!
I saw in another thread posted earlier this week (I think) that a member contacted Hasbro, and they stated that the FS AJ/DD (Rainbow Power) would be shipping to stores along with the Cutie Mark Magic ponies (Like Cadance/Sunset Shimmer) sometime this month to the US stores like Target, Walmart, etc (at least, that's what I'm assuming, as that's where I've seen the others at). So I'd hold out hope for a bit that they might appear in early spring (March, April) depending on the stores.
I'm super excited about this news, and really hoping it's true!
But, if you can't wait, there is a bulk TaoBao order going right now (today's the deadline to place orders) and the FS AJ/DD are listed on the website. PrincessGryph has posted the thread...
Hope that helps! Have a great day!