No, they don't, and if you're expecting one I'm sorry to break it to you but it's never going to happen. If you want proof, look no further than all the legendary skins that are WAY older than Pulsefire Ez and never got a VU. Annie in Wonderland, Red Baron Corki, Firefighter Tristana, Magnificent Twisted Fate, Alien Invader Heimerdinger, etc. All those skins are legendary skins that today would not even compare to a 975 skin. The only ones that have gotten VUs are Firefighter Tristana and Alien Invader Heimerdinger, and that's because Tristana and Heimerdinger themselves got VUs, and even then, those skins still don't really qualify as Legendary. They retired them rather than VU them.
Hell, look at Legendary skins that are older than PFE and are still for sale right now, like Gentleman Cho'Gath, Bloodlord Vladimir. Gatekeeper Galio, etc. These skins ALSO don't even compare to 975 skins today, and again, none of them are getting a VU until their respective champion does.
Skins do not get VUs until their champion does. They will not make an exception for Pulsefire Ezreal, nor should they.