Ok, I'm updated, and not bricked - so, from my brief interation with it so far, I can sadly report that there is still no support for chapters on DVDs.
However, YouTube is far better on it.
It doesn't constantly ask if you want to save your account settings
It goes directly to your favourites, rather than uploaded videos to your account.
They display as a list on the right with small thumbnails and a large thumnail to the left, rather than the side scrolling laggy thumbnails. The list generates quickly and scrolls smoothly.
In the search option on youtube, the "keyboard" is smaller and to the left and on the right is has your search history (which saves a lot of pain retyping search queries)
Anyway, there may be more things relating to those pesky mp4 files and such, but for now, I'm just gonna watch some flicks and wait for the full update list.
Good work WD.