Nokia announced two Windows Phone 8 devices today. The lower-end one, the Lumia 820 has a 4.3" 800x480 Clearblack OLED display. Other features include a 1.5Ghz dual-core CPU, 1GB of RAM, 8GB of storage (and a microSD slot) and a 8mp camera. The Lumia 820 will ship towards the end of 2012.
The second phone is the flagship Lumia 920, which unfortunately does not have an OLED. It does have a very good LCD though - 4.5" WXGA (1280x768) resolution. Nokia claims that this new LCD is the brightest one on the market (25% brighter in fact than anything out there) and it's also the fastest LCD Nokia has ever shipped on a smartphone. Other features include a 1.5Ghz dual-core CPU, PureView 8mp camera (with hardware stabilization and good low-light capabilities)
