Chopin called it that because he, like most artists, supported the French revolution and uprisings against monarchy, and it inspired this song. I beleive Liszt also wrote a similar "revolutionary" piece.Nothing to do with the piano technique it involves
I'm not good with numbers, so I'd rate it as somewhere between beginner and intermediate.
Some quick searching. Found different stories and angles. One site says the etude was inspired by the conflict, another says it had nothing to do with the conflict and was coicidentally published at the same time.Weird eh?
Its basically for one hand so there not much of a problem in my opinion.
some say it is titled to commemorate the brutal suppression of protest against russian rule in poland,
Also I would note that Chopins etudes are an essential study before taking on the ballades as they will stand you in good ground to the technical difficulties of the works