Is the fibered K-theoretic farrell-jones conjecture true for cat(0)-groups?
Yes. More precisely, both the L-theory and K-theory Farrell-Jones conjectures with coefficients in any additive category have recently been proved for CAT(0) groups:
In Arthur Bartels, Holger Reich, “Coefficients for the Farrell-Jones Conjecture”, Advances in Mathematics 209:1 (2007), 337–362, it is proved that “with coefficients is stronger than fibered,” see Corollary 4.3 and Remark 4.4 on page 346.
[Edited to clarify the relation between the “with coefficients” and “fibered” versions of the Farrell-Jones conjectures.]