We will have to wait for more information but the lack of anything meaningful probably suggests there is very little innovation here other than styling. This is no 'all new' RX just a update to the existing.
It certainly isn't a 4th gen hybrid system, the engine isn't new just a minor rework of what is already there with a meaningless 5 hp more. Toyota have already said they have no immediate plans to implement CarPlay/Android Auto so we will have the same old slow, bug ridden, and unintuitive infotainment system.
Other things new to the RX just seem to be updating the old to current Lexus standards, for example an AVS option and the PCS/ACC system gets auto high beams and lane assist which is standard on all NXs and an option on the IS.
Hopefully all the things that were mentioned on the launch will be on the UK vehicles but Toyota GB/Europe have a habit of omitting certain things that are available the US and Japan.