It's true, or at least it looks to be true. January 31st, in just a few days time, Bosworth will release a new Kraftwerk Songbook, called "The Best of Kraftwerk Songbook". The songbook contains arrangements for piano, vocal and guitar for 12 Kraftwerk songs, all collected from their 1970's albums "Autobahn", "Radio-Aktivität" and "Trans Europa Express.
As all song titles on the back cover of the book (at least the now publiched version) are in German, I'd expect all lyrics to be written in German, but who knows - the book could be bilingual.
The complete list of songs:
Ohm Sweet Ohm
Trans Europa Express
Metall Auf Metall
But this is not the first time Kraftwerk's music is released in noted form. There is, for example, this UK published set of sheet music for Autobahn:
... and a US version:
... and Kometenmelodie 2, in both English and German versions:
... and an italian edition of Trans-Europe Express:
... and a version published in the US:
... and Tour De France:
... and The Model, naturally published in the UK: