Available Q2 it seems. Also more details on the SoC from Anandtech: 4 Cortex A15 on 28nm HPL (28nm low power with high-k + metal gates) running at up to 1.9 GHz and a fifth A15 core for low power work.
http://www.anandtech.com/show/6550/more-details-on-nvidias-t...