Hi Ching Ping,
Thanks for writing. While we do not have a Q3 webinar dedicated to the developer edition, the feature set is similar except for the built-in ability to schedule test list runs across you entire network from a single machine, this functionality is exclusive to our QA Edition.
The Conditional Logic, Extraction Support, Updated Test Explorer, Visual Debugger and Chrome / Safari 5 support features are all built into the developer edition and work the exact same way as the QA Edition.
I have attached a few images to this post to help point you in the right direction.
I will also be scheduling a special developer edition webinar to kickoff the new year this January, stay tuned to our registration page for more information.
Hope this helps and let me know if I may be of further assistance!
the Telerik team