Native GWT form fields validation framework plans?

Hi,

There is a common, recurring topic about doing form fields validation
in GWT.

Here's a good analysis of the current validation frameworks done by
Brendan
https://wave.google.com/wave/waveref/googlewave.com/w+sVgB2_shE
and more discussions at
http://groups.google.com/group/gwt-platform/browse_thread/thread/6d650f12321dfe93
http://groups.google.com/group/google-web-toolkit/browse_thread/thread/4aeef9d2195f1051/
http://code.google.com/p/google-web-toolkit/issues/detail?id=343

I know native support for validation was started. What are the planned
use cases to support? What's the current status and plans for it? (is
there a wave design doc?) Will it also work with non-RPC backends,
such as REST?

Here are a two use cases besides the basic ones, don't know if these
have been considered:
* some fields might need to interact with server in order to validate.
e.g. on sign up, check if the username entered by user is available
* multiple fields validation e.g. two password inputs, which should
match

Thanks,
Marius

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