The Sony NW-S203F appeared first in July. In the US Sony markets the NW-S203F in their S2 Sports line and gives a shipping date of September 15th.

In Japan Sony is going to offer the NW-S203F in three colors: pink, silver and black. The US currently only gets black.

The Sony NW-S203F comes in a spill and sweat proof aluminum casing. Sony has integrated some neat sports related features in the NW-S203F including calorie, steps and distance counter. Other features include shuffle, sport mode playlist, FM Tuner. The shipping date of the NW-S203F with 1GB storage is also shipping September 15th in Japan.
More details in this Sony press-release (Japanese).