Update: in mid-July Samsung confirmed that they have shipped over 10 million S3 phones, a slight delay but still a very good rate...
Samsung estimates that it will ship 10 million Galaxy S3 phones by July. They say it's hard to keep up with the demand to the new phone, and the company didn't secure enough mobile components. There are concerns that sales will be lower then expected in the current quarter, although Samsung's mobile chief says that supply issues will be resolved next week.
The S3 has a 4.8" 1280x720 HD Super AMOLED (with Pentile), a quad-core 1.4Ghz CPU (1.5Ghz dual core in the US), 1GB of RAM (2GB in the US) and an 8 mp camera (1080p video) and lot's of new software features. The phone weighs 133 grams and is only 8.6 mm thick.
