I contacted the previous seller. They are out of stock at the moment, and told me they have not date for new arrivals on the A123 cells.
I have been talking with another seller, who told me they were out of stock till yesterday. Posted some photos of the new cells, with a "Made in Korea" text in them, also more expensive than the previous seller:
http://es.aliexpress.com/store/product/Original-New-A123-20ah-Lifepo4-Cell-3-2V-5C-A123-Systems-High-Drain-Rechargeable-Battery-for/1394022_32256120830.html
Is it possible that they are manufacturing them in Korea? I never heard of a factory in Korea from A123...