The operating company were still saying May 2 months ago in the article below. Of course it was meant to start in December 2020.
The airport was pushing for 4 non stop trains an hour so depending which way you look at it the service will either double or the service will be half what was requested. At one point they were hoping for express branding on the trains. Combined services will see 16 trains an hour call in at Parkway. 2 non stop, 4 semi fast, 2 slow in each direction.
The actual trains are more modern on the Thamelink service and more commuter looking on the East Midland Railways service and a step backward compared to the existing diesel trains.
https://www.eastmidlandsrailway.co.u...-key-milestone