Firstly, here face has officially been revealled,
http://blogs.wsj.com/speakeasy/2011/03/06/the-last-airbender-legend-of-korra-exclusive-first-look/ Secondly, the voice cast has been announced too!
Janet Varney as KORRA
Kiernan Shipka as JINORA
Daniel Dae Kim as HIROSHI SATO
David Faustino as MAKO
Sheychelle Gabriel as ASAMI
Lance Hendrickson as LIEUTENANT
JK Simmons as TENZIN
To be hlnest I really only recognise the last two, but Janet Varney sounds familiar. JK Simmons playing Aang's son will be hiliarious though.
http://blogs.wsj.com/speakeasy/2011/03/07/the-last-airbender-legend-of-korra-exclusive-cast-announcement/?mod=google_news_blog