I bought Rhino 6 in September and was told that 7 wouldn’t be out anytime soon.
And now 2 month later its out. Sorry to say but thats pretty shitty service 
you could contact sales@mcneel.com they are usually quite humane regarding the transition, no promise though but better than hanging your head into the dust its worth a try.
one thing i believe should work anytime, they have a certain policy that if you are not satisfied you can return your licence and just repurchase version 7 then. keep your head up!
HI encephalon
Thanks for the advice I’ll try and contact them.