Im told Ping (Gainsborough) expect to have some heads mid to late June - complete and utter farce for a product they launched at the start of April and havent been able to supply since, but then they're pretty aware of my opinions of this
Edit: I have actually tried one, they had 1 adjustable one in the MK branch of DG (wrong stroke type for me though). Quite like what I see in the putter (easy to square, unfussy alignment aids, heavy enough weight) just be nice to actually be supplied one (already bought 1 other putter whilst waiting and expect im not done lol)
They are certainly available because I saw two in Auchterlonies golf shop in Monifieth on Tuesday. Not sure if they will post them, but they are a branch of the famous shop in St. Andrews, so reputable and trustworthy.