UPDATE: CD Projekt Red's community manager Marcin Momot states that the above contents are "not pre-order bonuses", but the "contents of the standard edition".
ORIGINAL REPORT: The Witcher 3's pre-order content appears to have leaked online ahead of its official announcement this evening.
The back page of today's issue of MCV lists the content (pictured above), which includes a selection of stickers, game map, official soundtrack, a Witcher Universe Compendium and a game manual.
A Collector's Edition, presumably with its own range of content, will also be revealed during CD Projekt Red's press conference tonight.
Want to watch it live at 7pm? Head through here.
The Witcher 3 launches on Xbox One, PlayStation 4 and PC in February 2015.