I preordered the ultra just before the end of the preorder window from carphone warehouse. They have no clue apparently of when they are going to recieve the stock. I heard roumors of people saying 25th of march or 31st when stock is being expected. The phone is available to order from Samsung with delivery 2nd of April which logically would mean that we should recieve the preorderes before then.. fingers crossed.
Ordered from D.I.D electrical on the 27th February and got my s20 ultra on March 10th, in future use them, they called me every second day to let me know what was happening