Hyrule Warriors Legends gets a season pass just like its Wii U counterpart did, with 4 DLC packs included to be released periodically in 2016. Buying the season pass will give you an exclusive costume for Ganondorf sporting his Wind Waker attire and will be available launch day.
If you pick up Hyrule Warriors Legends on launch day you can get a Hyrule Warriors theme for your 3DS and a transfer code to download the new characters Linkle, Skull Kid, Tetra, King Daphnes, and Toon link as well a trident weapon for Ganondorf on Wii U. If you’d like a free art book, you can preorder at GameStop.
Last but not least, Medli can be downloaded for free on both Wii U and 3DS versions of the game on the launch day of Legends.