realXtend project posted a note at their web site:

The two-month period of seemingly quiet research and planning is nearing its end and we have decided on our strategy for the first half of 2009. We will be focusing on creating a new viewer and continuing work on the realXtend modularization effort as well as improving our authentication (OpenID!) and distributed storage services. We will also be working on global voice and instant messaging, which will form the backbone of future realXtend communications. We welcome you all to discuss the issues on our email list at http://groups.google.com/group/realxtend. We welcome everyone to participate and you can expect more news shortly.

It seems that realXtend is taking the new cooperation with Opensim seriously as they will continue the work with Modrex. 

See also earlier related news items:

ModRex 0.2A now in SVN (Jan 7th)
realXtend starts a new from-scratch viewer (Dec 13th, 2008)