I've bought the Hardline Premium package for xbox 360 but have now just bought an xbox One. Will the premium package transfer across or am I going to have to fork out another £40? I've seen theres a next-gen upgrade thing for Battlefield 4 (http://www.battlefield.com/uk/battlefield-4/next-gen-upgrade) but can't find anything about Hardline.
Based on this Battlefield Forum Post it would seem like the Hardline Premium Package will not transfer across from your Xbox 360 to your Xbox One.
I've done some more digging on this so hopefully I'm allowed to answer my own question...
Owners of Battlefield™ Hardline Premium for Xbox 360 will also get Premium access on Xbox One.
and if I go to https://store.xbox.com/en-GB/Xbox-One/Dlc/Battlefield-Hardline-Premium/31f9628b-0142-420d-a94b-48d251a0c3b1 the price shows up as £0.00 rather than £39.99 so it looks premium will transfer.
I'm still waiting for the XBox and Hardline to arrive so I'll try and remember to update this with a definite answer when I get it.