I love you all to death (Just so I can smash bros with you) (SSBWiiU/3DS)

[NICKtendo DS]

Yet Luigi still doesn't use stuff from Luigi's Mansion. :/

That could change, it has not been confirmed nor deconfirmed. The screenshot of today shows that Luigi's jump animation was changed.
Text that came with it: "Luigi’s jump now has him paddling his legs. His vertical leap is undoubtedly high!" -Sakurai