I'm not going to hold my breath. I think they have done their own tests, which were briefly referred to on their website, and don't want us to see the results, especially now that Epson has made reall yellow channel improvements without sacrificing gamut. If indeed Canon has gone backward it will be a real shame. I totally love my big Canon for 7 years now for all kinds of work and certainly didn't need a gamut increase at the expensive of permanence.
I just noticed WIR posted data for UltraChrome HDX earlier this month. I wonder if there's Lucia Pro data coming soon. One can hope!