There are not examples nor archetypes available in JBDS 8.1.0.Beta1.
This is probabaly because devstudio cannot pick up any links to examples descriptors from ide-config.properties (There are just links for 9.0 and 8.0. 8.1 is missing)
I suppose this does not concern JBT 4.2.3.Beta1 as it should pick up 4.2 links. I'll try it in a minute.