The big news for me is we got more then 2 songs this time, and some are new remixes as well.
Of course the Geno news is certainly a big one as well but not too surprising. When Sakurai said Nintendo gave him the choices for DLC, that kind of hurt his chances. The last 3 are probably going to be from famous third party characters, or from more recent Nintendo titles. Poor Geno certainly had a lot of support online, but I imagine Nintendo wants characters that the general public has either heard about or someone who might introduce them to a current Nintendo franchise like ARMS which they're still selling at full price.