Before it I was very skeptical as I knew that USB doesn't have near the bandwidth to support an "HDMI signal" (uncompressed HD signal and sound) coupled with the fact that I had never heard of "MWL" (which turns out is actually MHL) and didn't find anything about it with a quick google search (didn't help that I was searching for the wrong thing ).
After watching the video it makes a lot more sense and I am excited for this. They are not using the USB protocol to send the video/audio data, instead they only use a usb connector and the device has built in switch that changes between hardware internally (USB or MHL).
I'm still not 100% sure that it works with all current TVs. If you go to 2:05 in that video it sounds like you need an adapter to use it with old tvs. The thing is that he could mean that you only need the adapter if you want it to charge your phone, but the way he states it makes it sound like it just doesn't work on a legacy tv without the adapter.
No problem, glad to help out... I've been searching like a mad man on SGS2 stuff and ran across that link, sounds very interesting and could be a great way to view videos recorded from a 1080p video source like this cell phone.