They do not have them for Canada. The recommendation is to use the US extended norms. In order to create extended norms, you need a reasonably-sized pool of HG children. That hasn't been quite as easy to accomplish in Canada, I gather. (Not meaning there aren't as many HG children, but probably due to access.) According to this FAQ from Pearson Canada, the WISC-V extended norms should be out late in 2016: http://www.pearsonassess.ca/content/dam/ani/clinicalassessments/ca/programs/pdfs/wisc-v-cdn-faqs.pdf

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