First impressions of Google Wave: broad topics with a lot of individuals can quickly lead to chaos...chaos in the sense of having a ton of blips to follow containing a variety of themes.
My suggestion at this point is to create a Wave for each technical improvement or related improvements that WiZiQ is working on at any particular moment. For example, we create a Wave for desktop sharing. Techies, teachers, trainers, etc. who are interested would work within this one Wave in an effort to see this improve through to the end. That way, discussions would stick to only this one improvement. If improvements are simpler, less involved, perhaps related improvements could be lumped together within a single Wave as well. But I think WiZiQ would be in a better position to determine how to prioritize and lump new tech. developments together or separately in this fashion.
Since we don't really know how long it's going to take before we all get our invites (hopefully not too long), it might be premature to be thinking specifically on which improvements to list out at this point. What we can do is to continue communicating and adding all those who are interested into a general WiZiQ Wave to get started so that we learn how the Wave works. I´m sure it will take no time for WiZiQ to break down their future improvement plans into manageable chunks that can be brought into Waves in order for all of us to collaborate on.