Samsung's Tweet said (roughly, via Google Translate) that "Once a specific launch date [is scheduled] we will notify you via Twitter first." In other words, don't call us, we'll call you.
Samsung also sent along the following tidbit:
"The successor to the GALAXY S II smartphone will be unveiled in the first half of the year, closer to commercial availability of the product. We cannot confirm the detailed information at the moment."
- 1.5GHz quad-core Samsung Exynos processor
- 4.8-inch “full HD” 1080p resolution with 16:9 aspect ratio display
- A 2-megapixel front-facing camera and an 8-megapixel rear camera
- Ceramic case
- 4G LTE
- Android 4.0 (Ice Cream Sandwich)
Whether that's true or not remains to be seen, but one reason Samsung might be making this move was the criticism the company received for the slow U.S. device rollout vs. the rest of the world.