Its crazy that people are trying to think she would be out soon, valentines and lunar revel are within the next 2 weeks 14 feb and new years in the Chinese calendar is on the 19th, so we have jinx and the warring kingdoms nid and kat coming, to top it off sweetheart annie and heartseeker varus are due with the annie skin already penciled in for 5.3.
Lets look even further, there are 4 other skins, the Inquisitor (warden) and marauder skins that have been on the pbe for a couple of weeks now that will probably be released before dj sona. The sona skin has JUST been released for testing on the pbe and most skins get at least a month on the pbe for testing before going live, then think that dj sona is an ultimate skin so there will probably have to be a lot of testing and texture rebalancing and little things here and there worked out.
TBH i am not expecting to see her till mid March or early April and am not getting my hopes up that she will be released before then, now if she comes out before then i will be happy as i am looking forward to it.
I guess people just want the new content but would then get upset if they released her and loads of bugs were found and she had to be disabled for a time to fix it, then what an uproar you would have.
All good things to those who wait guys.