BBC Radio 4 Facebook page just posted this. Anyone know anything more about this? Googling doesn't seem to help very much... Casting rumours? Anything?

Update: IT'S HAPPENING! THIS IS NOT A DRILL. OUR MASTERFUL OVERLORD THE BBC SAYS:

BBC Radio 4 has today confirmed that the station will be collaborating with acclaimed authors Neil Gaiman and Terry Pratchett to create the first ever dramatisation of their co-penned cult-classic, Good Omens.

The audio drama, which begins recording today in a secret London location, has a cast including Colin Morgan (Merlin, The Fall) as Newton Pulsifer, Josie Lawrence (Skins, EastEnders) as Agnes Nutter and Paterson Joseph (Peep Show, Green Wing) as Famine, as well as a host of delightful cameos, from the Gardeners' Question Time team to Neil and Terry themselves. Other cameos are set to delight listeners, but they are under wraps for now. Probably in a dusty occult bookshop in Covent Garden, but no one is quite sure.

Mark Heap (Spaced, Green Wing, Stardust) and Peter Serafinowicz (Guardians Of The Galaxy, Star Wars: The Phantom Menace, Shaun Of The Dead) will be taking the central roles as angel and demon, Aziraphale and Crowley, respectively. The star-studded cast will also include Clive Russell (Game Of Thrones, Ripper Street), Julia Deakin (Spaced, Hot Fuzz), Louise Brealey (Sherlock), Simon Jones (Hitchhiker's Guide To The Galaxy), Arsher Ali (Four Lions, Complicit, Beaver Falls), Phil Davis (Silk, Whitechapel, Being Human) and Mark Benton (Waterloo Road, Land Girls) to name but a few.

(thanks dented GuanoLad!)