According to some reports, and the screenshot seen below; Cortana might be adding support for Spanish commands and alerts soon. The update brings the same Cortana interface in Spanish (rather than changing the character as was done for the Chinese release).
This is great news for native Spanish speaking WP users of course, as well as the Windows Phone community in general. Anyone else excited for Spanish support? What language should Microsoft add next; Arabic seems like a smart choice, but would require a lot of work.