Technically, this should bear an enormous "EXCLUSIVE!" tag in the headline, since Warner Archive's George Feltenstein just announced this publicly for the first time on the latest episode of Screen Time (which will post by Wednesday).
Just in time for the premiere of Steven Soderbergh's Michael Douglas-starring Liberace biopic Behind the Candelabra on HBO, Warner Archive is putting 1955's Sincerely Yours on DVD for the first time. It was Liberace's one big starring turn, and it flopped big-time.
Here's a clip from the opening, from TCM's website:
Watch for it to pop on their store three weeks from today if you want the full Liberace Experience.