Photo News Today’s Dennis Hays says:

After meeting both John Sexton and [Kodak's] Scott DiSabato at the 2007 Photoplus Expo in New York, I sit down with them and discuss the introduction of the new [see previous post] T-MAX-400 B&W film. John goes into some detail regarding the films ability and his impressions from use.
As more [...]

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, [...]