In reply to Rohith, Lumia replied that they’ll be rolling out Lumia Denim soon following testing testing and operator approval.
Lumia Denim brings the always listening Cortana for the Nokia Lumia 1520 and 930.
The latter two will also get 4K recording, hopefully faster camera times too as well as Rich Capture (I think that might be the new Lumia Camera rather than denim? )
Other features seem to already be available if you have DP (live folders, better IE, Glance with weather etc)
@CreativeColon It will roll out soon following testing and operator approvals! 🙂
— Lumia (@Lumia) November 24, 2014
Cheers Alvester for the tip!