Google's Nexus-S phone was supposed to launch on the 20th of December in the UK, but Carphone Warehouse actually had some phones in stock yesterday (for £549.95). They quickly went our of stock though. In the US, the phone will ship on December 16th.
Google's Nexus-S is made by Samsung and is based around the new Android v2.3 'Gingerbread' OS. It has a 4" Super-AMOLED 'Contour display' (which means that the glass is curved, it's not a flexible OLED).