Specs:
4.8 inch HD Super AMOLED display made from Gorilla Glass 2
1.5 GHz dual core processor
1GB RAM
16GB or 32GB integrated memory with a microSD card slot
8 megapixel camera
1.9 megapixel front facing camera
2300 mAh battery
Also, NFC, and HSPA+ 42, which means T-Mobile most likely, and most likely better battery life than Samsung LTE phones in the USA.
Windows Phone 8, and probably the new Lumia reveal is slated for the 5th. I'm looking forward to it.
With Samsung stepping up like this for Windows 8, that is a good sign they believe in the platform going into 2013. It's also their thinnest windows phone yet.