The Spanish broadcaster TVE announced today that since opening the submission page already 700 entries have been sent it. Not all of them comply with the rules, though, they said. The most active region has been Madrid with 136 songs, followed by Barcelona with 53 and Valencia with 19.
TVE started the process on the 24th of November and will last till the 17th of December, the full list will be published 2 days later when the voting procedure starts on the broadcaster's website. This will last till the 19th of January when the 50 finalists will be revealed. All of them will participate in the selection shows.
You can still send your song in at this site, that is if you're of Spanish citizenship or have a proven residency there for at least 2 years.