The JBDS 7 alpha2b respin from http://www.qa.jboss.com/binaries/RHDS/builds/development/7.0.0.Alpha2b.installer/ is fat :
Latest Build: 7.0.0.Alpha2-v20130421-0725-B198

Universal Multi-Platform Standalone 666.5M (MD5)
Universal Multi-Platform EAP 6 Bundle 778.37M (MD5)

As opposed to the http://www.qa.jboss.com/binaries/RHDS/builds/development/7.0.0.Alpha2a.installer/ one
Latest Build: 7.0.0.Alpha2-v20130415-1444-B156

Universal Multi-Platform Standalone 463.0M (MD5)
Universal Multi-Platform EAP 6 Bundle 574.86M (MD5)

The respin-b includes pack.gz