Have not seen anyone post this here yet, but Kansas made this announcement this morning:

The band KANSAS announces that guitarist Zak Rizvi has resigned and that he looks forward to pursuing new projects.
We thank Zak for his many contributions throughout the years and we wish him well in his future endeavors.
KANSAS carries on with original member Phil Ehart on drums, original member Richard Williams on guitar, Billy Greer on bass and vocals, David Ragsdale on violin, guitar and vocals, Ronnie Platt on lead vocals and keyboards, and Tom Brislin on keyboards and vocals.