Second Life, Open Source, Third Wave?

Announcement is here

To quote

At Linden, we have always been strong advocates of the use of open standards and the advantages of using open source products. Though Second Life makes abundant use of non-standard technologies, our basic UDP protocol message system for example, we rely on open standards and open source implementations when appropriate and available. Since many of the components that will make up this network are not yet done, we are not publishing long white papers or RFCs at this time — instead, we are giving everyone what we have along with a goal of producing those open standards with the input and assistance of the community that has brought Second Life to where it is now.

To me Second Life has gone through two major waves - initially a wave of "builders" who made stuff, and now a wave of "consumers" who (mainly) buy virtual bling. (OK, OK...thats unfair

What will Open Source do - what sort of Third Wave will it bring?.

By making the platform open it should be possible to build better user interfaces (make Avatars easier to use), but the biggest impact will probably be to allow creation of many different world - in - worlds.

Not just one's own Second Life, but ones own Virtual Utopias?