As I said on another thread, the OW press release that just came out seems to suggest that UL won't join until at least April.
http://www.oneworld.com/news-informa...nguageId=en_US
TAM and US Airways will join on 31 March 2014 and SriLankan Airlines soon after.
Also, unfortunately GDS info can be wrong, as in
http://www.flyertalk.com/forum/ameri...s-flts-ow.html.