That proposal also used the "#" symbol, with the following rationale: "The symbol is already used within Javadoc to separate the class name from the method name in exactly this manner. The method literal syntax merely brings the Javadoc convention into Java source code."
It's a reasonable choice for full first-class methods; it doesn't fit quite as nicely if Oracle only introduces closures as a syntax sugar for anonymous classes.
But I think it's OK anyway -- it's concise and even looks a bit like clojure :-)
edit: Actually, now that I think about it, this wouldn't be the first time they introduced a new keyword with a language update. So much for that argument: