I really like the widescreen view, then again, I've got a 19" monitor so I don't have to scroll from side to side.
It still says MAYNOT POST ATTACHMENTS for me. (although I have not actually tried it.)

Same for me and I just tested it out by trying to start a new thread. The option for attachments was not available.

The one thing I have to get used to are the icons on this reply screen. I'm used to seeing "Quote" and now have to remember that it's the last icon on the right. Hovering the cursor over the icon will tell you what it's for.

I'm also very impressed with the red triangle that allows us to notify of a bad post. Very cool!