The most recent news is that the Constitutional court has ruled in favor of all protests, but I doubt this is the end of it.

What you likely saw is trolling by ElPais or some other media on the fact that The Constitutional Court Upheld Demonstrations on Reflection Days in a 2010 decision. But this doesn't make law and still the electoral board gets to decide. The latest news is that The Electoral Board has banned protests on Saturday. The organizers of the 15M protests have decided not to call for continued demonstrations, "but people will go to Sol it they feel like it".

One thing is clear: the organizers of this are legally and politically savvy.

On Wednesday they told people to not bring any alcohol into the crowd in order to avoid being removed by application of the anti-botellón municipal ordinance [which was enacted to prevent groups of youths having inpromptu drinking parties on streets and public squares].

Yesterday, after the electoral commission banned the protests for allegedly interfering with the electoral campaign, the organizers told people to not talk about political parties.

Today, they're saying that they won't officially call for a demonstration but people are individually free to do what they want.

Economics is politics by other means