WebSphere Process Server and WebSphere Integration Developer are now available. (WebSphere ESB is not yet available.) See More Info on WPS, WESB, and WID for a little recent history.
For WPS: Check out the announcement letter (PDF) and data sheet (PDF) for details. There is also some product documentation now online.
For WID: There will be an announcement letter (but it's not yet available). The data sheet (PDF) is already available.
Last but not least, the Info Center for both WPS and WID is now online.