Want to make this tool really useful and get a leg-up on the competition?
Workspaces needs voice chat. When you log into a workspace, a list of group members and current visiting members should be displayed or made available. Members could have meetings and discuss ideas, problems, opinions, solutions, etc using voice, text, and video. One member is selected as the moderator and can select one or more members to talk at any given time (1 - All). In addition, members can talk one-on-one directly in private or public mode to the group. Also, text chat may be implemented the same way.
Finally, I would recommend a video solution. With video, hundreds of thumb video windows could be displayed. The moderator would have a special color border to standout from everyone else. A person that wants to speak would have a different blinking colored border. Blinking border is similar to raising your hand to talk. If blinking becomes too distracting, the moderator has the control to turn it off, but the waiting color border remains unless the moderator turns that off too. The moderator should have lots of control - lots.
Example: I'm showing a PowerPoint presentation to a group of 50 members. I am talking during the presentation and all members can hear me. As I go through the presentation a member raises their hand (can be done in text, video, or voice chat). I pause the presentation and allow the member to speak. The member talks. I send a text message to two members while the person is talking. Then I continue to the end. At the end I open up for a discussion. Members raise their hand and I call on them. Then I allow a few members to talk together at the same time. They are asking each other questions and debating points. I close with my remarks and send a summary and thank you to all members who joined in on the chat as well as the ones that are members but were not present.
My recommendation is to use all three: text, voice, and video. If Workspaces doesn't, someone else will. My experience as a consultant is that Microsoft enjoys playing follow the leader instead of leading. The stock sits in a small range because there is no innovation like Apple - the eventual successor unless Microsoft finally wakes up!