One reference that appeared in the article only in a truncated form is the first one, to the Jacl press release. You're better off starting here. A reference that didn't make it into the article at all is John Ousterhout's What's New With Tcl?.
Steve Ball has generously made available on-line the chapter on Jacl and Tcl Blend from his forthcoming book.
Christopher Hylands posted a valuable page of corrections and observations regarding TclBlend within a couple days of its release. Also, Bob Jackson has made a particular point that the Solaris flavor requires the Native Threads Pack be added to a JDK 1.1.4 installation. Scott Stanton of Sun followed up with his advice.
Ioi Lam started the first home page for Jacl and mailing list (to subscribe, send mail to "email@example.com" with body "subscribe jacl-list your_email_address") while still a student at Cornell.
There are a few other Java-Tcl initiatives beside those emanating from SunScript.
I'm in the middle of re-writing my Java and Tcl references.
We touched on a few other Jacl points in replying to letters to the editor concerning the original article. We've also written specifically on Tcl Blend.