Customizable mounts including Hoverboards are still fully intended. Not sure which source you are using for Wildstar, but you may want to crosscheck stuff before just blurting it out.
http://www.wildstar-online.com/en/ne..._wildstar.php/
As for WoW, with the new FLYING mount that is now part of Archaeology, it sure looks like 6.1 will put flight back in as anticipated. So this topic for me is now more of a leisure time and less of a need to defend.