UPDATE 21/1/15 7.45pm: Dying Light developer Techland has commented on the wait for physical copies of the game by pointing to its publisher, Warner Bros. Interactive.
"We would like to remind fans and media that Techland is responsible for developing and creating Dying Light," a company spokesperson explained in a statement passed to Eurogamer.
"The publishing and distribution of the game is not handled by us. Once we at Techland know more about how the release of the game will be coordinated, we will immediately inform everyone."
We've reached out to Warner Bros. for more information.
ORIGINAL STORY 19/1/15 8.45am: You won't be able to buy a physical copy of Dying Light in the UK on the game's global launch day - next Tuesday, 27th January.
No reason for the delay has been announced, other than the fact that it will affect all territories outside North America.
"There will be a short delay in the release of physical copies of Dying Light in Europe, Middle East, Africa, Asia and Australia," a statement from developer Techland posted to the game's official Facebook page explained.
"The game will have a global digital release on PlayStation 4, Xbox One and PC of January 27, 2015. As physical production has a longer lead time than digital there is some delay in the aforementioned territories.
"We will share information on the availability of physical copies as soon as it is confirmed."
It means that on the game's launch day, only the more expensive (and non-refundable) downloadable versions are available.
You can currently pre-order the Xbox One version of Dying Light for £54.99.
On Steam the game costs £39.99 to pre-purchase, or £55.99 for a bundle including the game and its season pass.
Last week Techland unveiled a 3D-printable zombie bikini statue for you to download and paint yourself. It's cheaper than buying the game, at least.