Microsoft Development of Expression Web 3
I have a reply from a MS forum moderator:
"We understand that add-in support is important to our customers and partners. We remain very dedicated to supporting add-ins and have no intention to ever discontinue add-in support in Expression Web.
However, as part of the development process for Expression Web 3, it turned out that we needed to do more work to make sure that add-ins could work the same way that they did in Expression Web 2. As a result, add-ins are temporarily not available in Expression Web 3.
There will be an update made available this fall that will restore add-in functionality. Just as in Expression Web 1 and Expression Web 2, it will be up to add-in developers to update their add-ins for Expression Web 3.
I have had many conversations about this with WebAssist's CEO over the last several months - so I can only assume that what you have read in the WebAssist forums is a misunderstanding.
I hope that this clarifies things for you. Feel free to reply if you have any other questions.
That's reassuring news :)