Development on Glass needs to be simple and fast. It's very personal and tweaking things for your own use or making niche applications is going to be common, going through the standard Android app development takes too long for exploring a new idea. We're taking our experience hacking on Glass (see http://openshades.com
for details, previously called openglass) and are developing the tools we think are missing to really let Glass shine. The first of these tools is WearScript, and our goal is to minimize the time it takes to prototype on Glass.
and we are active in #openshades
on IRC freenode if you'd like to participate.