If you're talking about official MIUI8, it's supposed to be released in mid August, 16th, to be more precise. I don't use xiaomi.eu MIUI8 rom. I'm using the v7.5 one until official is released. And yes, you're right. The 7.5 is released only for Kenzo, for Hennessy, nothing so far. Stick to your 7.3 or what you're using until official release of MIUI8 or chose something custom.
Kind regards,
