I was a little surprised to see no mention of an NT Live screening of Follies in the National's announcement of its plans for 2017. The announcement says:
"The following four productions will be broadcast by NT Live this year and in 2017:
15 December sees NT Live broadcast the acclaimed No Man’s Land live from the stage of the Wyndham’s Theatre, with Ian McKellen and Patrick Stewart in Harold Pinter’s classic play, produced by Playful Productions.
On 2 February 2017 Lucian Msamati takes on the role of Salieri in Peter Shaffer’s Amadeus, featuring live orchestral accompaniment by Southbank Sinfonia, broadcast direct from the NT.
Josie Rourke directs Gemma Arterton as Joan of Arc in Bernard Shaw’s Saint Joan, broadcast live from the Donmar Warehouse on 16 February 2017.
Ruth Wilson plays the titular role in a new version of Henrik Ibsen’s Hedda Gabler, directed by Ivo van Hove, broadcast live from the NT on 9 March 2017.
NT Live will also broadcast Twelfth Night, Salomé and Angels in America. Dates to follow."
I would have thought Follies was a sure bet for an NT Live screening. Hopefully it still will be, and they just haven't announced it yet.