9 Sqn will be based at Lossiemouth, to be stood up later this year (which means 31 Sqn will take the Tornado out to its retirement in 2019).
As for 11 Group, here are the CAS' comments verbatim:
"The new Group itself will be Number 11 Group - of Battle of Britain fame – a battle which in so many ways was an early demonstration of the power of multi-domain capability and command and control. And to keep a proper eye on efficiency and leanness in our command chain, there will be no increase in star count or overall headquarters staff as a result of forming Number 11 Group."