Glassfish v3  will be the next major release of the GlassFish application server. The focus of the release is modularization, enablement of non Java EE containers
and embedability. GlassFish v3 builds on the strength of GlassFish v2 but takes a completely new approach, providing a highly modular, lightweight, extensible architecture.

GlassFish v3 Technology Preview 2 (TP2) is a milestone release of the GlassFish v3 Application Server. You can find the TP2 glassfish preview bundle here.
This page provides a brief description of TP2, and points to the information you need to get started. Here is the information on what is part of TP2

Metro will be available as an  Update Center module in V3 as part of the TP2

This is a preliminary guide on how to work with Metro in the current development v3 builds.
Note: This can be subjected to change in future.

Steps to install and run v3.

1. Unzip gfv3-preview2.zip downloaded from  here.

 This is the web distribution for v3 and does not have support for EJBs. For TP2 we will only support JAXWS deployment ie.webservices with webapps
whose versions are 2.3 or 2.4. Support for
JSR 109 based services is in progress and will be available after TP2.

2. Run glassfish-v3tp2/bin/updatetool.bat 

You get a prompt like this

The software needed for this command (updatetool.bat) is not installed.
Press any key to install the necessary software, or Ctrl-C to quit.
After software installation is completed you may re-run this command.

Press any key to continue . . .

It downloads the necessary files

Platform: windows-i386
Software repository: http://pkg.glassfish.org/dev/windows/gf3000_2000/
Installing pkg packages...
Installing: python2.4-minimal@2.4.4,0-6.564:20080425T194712Z
python2.4-minimal@2.4.4,0-6.564:20080425T194712Z: manifest file doesn't exist ye
t, fetching from server
python2.4-minimal@2.4.4,0-6.564:20080425T194712Z: downloading files.............
................................................................................
..........................................................................
python2.4-minimal@2.4.4,0-6.564:20080425T194712Z: installing files...
Installing: pkg@0.1.4,0-6.564:20080425T194710Z
pkg@0.1.4,0-6.564:20080425T194710Z: manifest file doesn't exist yet, fetching fr
om server
pkg@0.1.4,0-6.564:20080425T194710Z: downloading files...........................
........................................
pkg@0.1.4,0-6.564:20080425T194710Z: installing files...
Installing updatetool packages...
Installing: wxpython2.8-minimal@2.8.7.1,0-6.564:20080425T194728Z
wxpython2.8-minimal@2.8.7.1,0-6.564:20080425T194728Z: manifest file doesn't exis
t yet, fetching from server
wxpython2.8-minimal@2.8.7.1,0-6.564:20080425T194728Z: downloading files.........
.............................................................
Installing: updatetool@2.0,0-6.564:20080425T194726Z
updatetool@2.0,0-6.564:20080425T194726Z: manifest file doesn't exist yet, fetch
ng from server
updatetool@2.0,0-6.564:20080425T194726Z: downloading files.....................
................................................................
updatetool@2.0,0-6.564:20080425T194726Z: installing files...
Update Center initialization complete.

This installs the UpdateCenter

3.Run glassfish-v3tp2/bin/updatetool.bat again 
and that brings up the gui like this
click on the Available Add-ons

4. Select Metro Web Services Stack and click install

This will copy webservices-rt.jar, webservices-tools.jar,webservices-api.jar and jsr109-impl.jar to
glassfishv3-tp2/glassfish/modules folder. Next you can start the GF using

glassfishv3-tp2/glassfish/bin/asadmin start-domain domain1

5. Deploy your war like this 
glassfishv3-tp2/glassfish/bin/asadmin deploy foo.war

You can try metro samples from https://metro.dev.java.net/
Please give us feedback if this works for you .  You can file your bugs under https://glassfish.dev.java.net/issues/ category webservices and version v3.

Additional Information
Project Metro

V3 Engineers Guide

V3 Build Instructions