WoodenPints on 30 January 2017
"Very soon we will unlock BackerKit surveys and allow you to make final adjustments to your game platform including Nintendo Switch, plus the opportunity to upgrade to a physical version for PS4 and XB1. Wii U backers affected by our recent announcement can also request a refund."
That's good news as Wii U backers can get a refund if need be and it looks like if you backed for PS4/X1 you can also change to the Switch version and the upgrade to a physical copy.
