I think the lack of response was/is simply that it is so new. But I can give you one now.
First it should be pointed out that EW is not technically an upgrade to FP. Whether you download the 60 free trail from MS or outright but it, it will install along side FP so you do not have to worry about loosing FP. And if you already have FP, the "upgrade" to EW is only around $99 ($300 new I believe). That being said...
EW is far superior to FP in every respect. The only thing it does not have is the "preview pane" though it still has the design, code and split views.
It has about a dozen full CSS templates of common layouts to start from. Out of the box, I think it defaults to a XHTML strict doctype with utf-8, though it may be XHTML Transitional (can't remember off hand). Regardless, you can change that.
It publishes using either FP extensions of FTP and you can open any page live via FTP and edit it.
Most important, it does not either add useless code or alter existing code. You can also edit .asp and .php pages without any problems and it has more code color options for all these.
I like the fact it points out spelling errors in all codes and not just in content. And it will tell you when something is not compatible with the doctype you are using.
It has a basic built-in image editor which is good for quick edits, but nothing fancy.
Another nice feature, I think, is when you are working in the code view, in the CSS window it will show you the CSS being applied including font size, family, colors, etc. And, when you are working with multiple <div>, if you place your cursor at the end of a <div> tag or the beginning of a </div> tag, it will tell you what <div> you are in.
It has built-in controls for asp.net which I have not tried yet, but it does include a 2 hour dvd training video on using asp.net, though I do not know if the training video is available on the trail download. I tried the trial and then bought a hard copy which included the DVD disk.
I can go on, but I think you get the point. I have not really found a down side to it yet and would highly recommend it. In the end, I think the best thing to do is download the trial and play with it.