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It's a very early tech preview.

Wouldn't "adoption" include the things you listed?

There is apparently some support for Eclipse[1], but I have not been able to find more details.

[1] http://dartinside.com/2011/live-from-dart-launch/#liveblog-e...

Perhaps just not have them ready yet? Who said Google wants "quick adoption"? The SPECIFICALLY state on the language page that its design is in flux and they ask for user input to improve it.