I got the following email:
From:  "xna team" <noreply@microsoft.com>

The relevant non-US resident tax forms has not been received by our payment provider.
For this reason it will not be possible to process any payments and you will not receive
money for any games you have sold.

In order to get paid for money generated for your games the relevant W-8 forms
need to be completed and sent to the following address:

Microsoft Community Games Payment Processing
Attn: Finance Dept,
29011 Commerce center dr,
Valencia, CA - 91355
USA

You can also fax the W8BEN. FAX Number : 1(661) 554-7240

Thanks again for making our community great!!

The XNA Team

Is this SPAM?  I am a US developer and I want to warn everybody (especially the non-US devs) if this is SPAM so the don't fall for it.

See this post.