FYI, Linda Silverman is currently in the process of collecting WISC-V extended norm data. According to Pearson, she had collected 6 of an anticipated 50 cases by March 2016, using a convenience sample (presumably of clients otherwise referred). The research update document says the anticipated length of study/data collection was 1.5-2 years. So if she's only 6 cases in, she probably just started data collection, which means extended norms probably won't be out for a little bit--but at least they're in progress.

...pronounced like the long vowel and first letter of the alphabet...