About Carmen as a LP for Alina - I think it's a good choice for her. Eteri has very strategic thinking when it comes to skating programs and she knows very well that most people think that Alina's weak spot is artistry (I don't agree with this, it's just that being Kitri in DQ doesn't give a big opportunity to express drama and feelings, it's just the type of storyline. Of course Black Swan and Anna Karenina would be much more dramatic characters). So she chooses something that gives Alina the opportunity to show character, playing a bit with the audience.
We were worried that she will get 2 new programs and that it could be overwhelming for her - well, Carmen is again a Spanish theme, she is used to the specifics of this type of skating so there is a mild change but still there is a common element with her old LP. So that Alina feels comfortable with it and not starting from zero in terms of arm positions, getting used to the specific beat of music etc.
Seeing the short videos from Daniil, especially the one with the dramatic pose when she is turning, I think his version of Carmen will be inspired from the ballet Carmen
https://www.youtube.com/watch?v=IDMcWSYali8
Especially at 2:01 you can spot the foot position of the ballerina, pointing to the ceiling just like Alina's. I think his mother will again be helpful and will prepare Alina for this choreography.
If Alina manages to look and dance like Vishneva, all the PCS points will be hers. ^^
And the fact that they decided to announce the program so early, knowing that the other skaters will find out about this, they did it on purpose. Maybe to make them assume that Alina's program will be a boring warhorse and not to see her as a threat? Or to 'make a reservation', so to say, so that nobody decides to use Carmen this year? I don't know, but Eteri and her team use their brains when doing something and that's why they are now rewarded for it.