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This commit (http://drupalcode.org/project/ckeditor.git/commitdiff/f6abbda281738527d1...) added a call to _ckeditor_requirements_isinstalled(), but fails to load the inc file that defines the function. So I'm seeing a fatal error when installing:
FATAL ERROR: CALL TO UNDEFINED FUNCTION _CKEDITOR_REQUIREMENTS_ISINSTALLED() IN /WWW/COMMONS-7.X-3.X-DEV/PROFILES/COMMONS/MODULES/CONTRIB/CKEDITOR/CKEDITOR.MODULE ON LINE 615
It could be because it was loaded via an install profile instead of just enabled as a new module.