TV and Satellite Week's twitter mentioned Spring yesterday, along with a picture of Aneurin Barnard as Richard III
https://twitter.com/TVSatelliteWeek/...05771178303488
I'm hoping for around Easter, but nothing definite has been said about the date yet. I actually think it's still filming. July 31st seems unlikely though, for one it's a Wednesday and I'll be very surprised if this doesn't air on a Sunday.