Ben,
Here are my answers/thoughts.
1) I don´t want to talk to much about V6 on the public forum since the version isn´t officially released yet but I have spoken to support about the "Basic" theme, which will be released for extjs V5 within the next week or so (I have also spoken to the Codaxy team who has created the theme) and the new "Basic" theme will HOPEFULLY be included in the official V6 of Aware IM. I use the "Basic" theme as our main theme for several of our products (see link/example below) so not having it is a dealbreaker for me re upgrading to V6. If I would have chosen something else I would have probably gone with the W8 themes since they look good and has the most options (including multiple sizes, different colors for different UI components, etc..). I have thought about using the official extjs "Crisp" theme and think it can turn out real nice when used properly. For an example of the "Crisp" theme used in a nice way and in a nice application take a look at www.pixx.io.
You can see a screenshot of 1 of our main applications on our site. I haven´t shared in on this openly before since we haven´t really publicly launched anything yet (we are right now relatively close to launch) but you can see a screenshot if you scroll down to the middle of the first / main page: www.sparkr.info .
2) We have different types of apps, 1 (first) SaaS app (public), 2 private SaaS apps (custom developed SaaS app for a client/company) and 1 project in development. We are also looking into several new ideas for applications (SaaS).
PS: We are also currently looking into providing custom themes for Aware IM so there might be a lot more options for us all to chose from in the future. Not at all certain but is an idea we are evaluating.