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I think that the gurus out there ( @x00 @Lincoln @Todd @422 @sahotataran and more... ) could find this interesting. Here a review.
Hmm looks interesting, seem to recall looking into this cpl of yrs ago. Will have another delve thanks.
422 Real Estate Australia , now open Check it out
These concept are really interesting and cool, though still early days. I would say though anything that has the potential to make you life easier like GWT, has the potential to add anniversary complexity to the final product, as it is "complied" javscript you are not controlling directly the final output. In some case it can be quite messy, and the necessity to handle everything is a single language, can actually be an obstacle. In the case of dart it is not just a specially compiled output,you are running special engine. You have to consider whether this is really suitable for what you'd want.
grep is your friend.
Man, I hate to say this, but I looked at the first link with their example I just really thought it was some bloated code. Not too bloated, but if the first code you show someone looks like that I really worry.
Then I see it's a google initiative and I want to read more. Who knows? Could be interesting, but sometimes engineers are too smart for their own good and really complicate things. Just look at some .net or java libraries.