Just checked, and as of this afternoon, GM has not officially confirmed any C7 Z06 auto show appearances (of course other than NAIAS). This is similar to what we "didn't know last year at this time," i.e., lack of confirmation so far doesn't mean that there won't be any more auto show appearances in 2014.
Similarly to last year at this time, there are only two "show cars" at this time, and, GM will not send a testing, "manufacturing validation build" vehicle to an auto show.