I dont know if it is yet supported. However, I also would like a13 to be supported, especially for tablets, for the following reasons:
-low energy consuption: screen only 7 inches uses much less energy than a tv which is what mini pc sticks use, also it has sleep mode that i dont find in mini pcs
-debian support already exists, sd card images available online for downlading
-not so different from a10 so I would think it wouldnt be so difficult to build? but i might be wrong
take care and good luck!