  Deformations of ordinary varieties of K3 type can be described in terms of
displays by recent work of Langer-Zink. We extend this to the general
(non-ordinary) case using displays with $G$-structure for a reductive group
$G$. As a basis we suggest a modified definition of the tensor category of
displays and variants which is similar to the Frobenius gauges of
Fontaine-Jannsen.
