I don't expect Yuna to regain her 2010 form in time for Sochi (or ever), but she needs to find another coach like Orser, who knew what to do with her talent and helped her a tremendous amount on the road to OG. Her 2013 programs are bland and take little advantage of her magnificent artistry, IMO.
I think Yuna should stick to the 3Lz-3T and 2A-3T layout. Those jumps give her huge GOE.
Her flip is less reliable than her 2A-3T.
If Yuna goes clean then there are only two other girls who can beat her. Both of these girls need to be absolutely clean (very unlikely) with more ambitious layout. Caro is less reliable when it comes to ambitious content. Mao is prone to URs.
Anyway, I can see her defending her title next year. And in the off chance that Caro/Mao have the skate of their lives to beat Yuna's skate of her life, well, then a comet will hit the earth the next day.
Yuna's PCS and +GOE makes up for her layout without a loop. She doesn't need it but theoretically the best layout for her is
The only question mark is the 3F-1/2L-3S which would be a new combo for her. But she gets incredible speed out of her flips and lutzes so the 3S should be no problem. But the combo would make her more susceptible to injury probably.
With a really strict tech panel, the only skater that can beat Yuna now is Kostner. If Mao brings her 3-3 and 3A, she can outjump Yuna
More or less: more is more