Right that's what I also took that to mean that the phone itself was due to be released soon.
I looked at the software updates for the Aquos Crystal here: http://support.sprint.com/support/article/Find_and_update_the_software_version_on_your_Sharp_AQUOS_Crystal/WServiceAdvisory_542_GKB76042?INTNAV=SU:DP:OV:UG:SharpAquosCrystal:FindAndUpdateTheSoftwareVersionOnYourSharpAquosCry
and didn't see any mention of the international wifi calling update. If you check out other phones like the S4, S5, Mega, Note 3, G3, G Flex, M8, E8, etc. it specifies in one of their software updates when international wifi calling was enabled. When the Aquos Crystal gets it's international wifi calling update it should become listed there.