ASUS started pushing Android 4.2.1 to the Transformer Pad Infinity exactly one week ago, but if you've been waiting for the blob to hit the company's download site for whatever reason, it's available now. This makes available build 10.6.1.14.4 to those who wish to manually flash (or need to recovery after a catastrophic event).
Currently the full firmware download is available for the US (United States), WW (Worldwide), and TW (Taiwan) versions of the HD tablet. Other parts of the world will have to wait
Hit the link below to grab the appropriate download for your device.