Maps, a partial response to your questions. Until recently I always associated Timur Askerov with Oxana Skorik. They work very well together. In the last year they seem to be cast more with other partners. One reason may be to give Oxana Skorik more experience outside of her usual comfort range. It appears to be working fairly well. She seems to be growing and becoming more confident. On the other hand, Timur Askerov is a very solid and supportive partner, whom the Mariinsky would maybe like to share with other ballerinas. It worked very well with Olga Esina in Swan Lake last October. They may also want to give him a chance to develop his own identity and style.
A quick check does show Timur Askerov scheduled to appear with Alina Somova in Don Quixote, March 26.http://www.mariinsky.ru/en/company/ball ... ny/somova/
(see Upcoming performances, box upper right)
Regarding Olga Esina, she is scheduled to be Giselle at the Festival. I'm really looking forward to this one.