Thanks to El Pais, we have some of the commentary.
Yoani (in a telephone interview): Nothing I have written in my blog is as pointed as my absence from the ceremony.
Sanjuana Martínez, Mexican winner of the prize for investigative reporting: I would like to send out a greeting to Yoani, whose absence is a symbol, no more no less, that there are no changes. In Cuba you can buy electrical appliances and cell phones, but there is no free press.
Gervasio Sánchez, winner of the prize for photography: The prohibition creates a greater media impact and has negative repercussions for the image of Cuba.
There's more, but my powers of translation fail me. Some even questioned Spain's policies toward Cuba.