You can read the complete press release, but the highlights are:
- It’s the "world’s sharpest" and "finest-grained" ISO 400 B&W film.
- Pushable 2 stops up to ISO 1600.
- Availability "will occur on a stock-turnover basis, beginning in December 2007".
- The new film code will be TMY-2.
There’s a surprisingly informative Q&A sheet (PDF) about the old vs the new film, check it out.