This is the response I got from Rovio:
Your request (#121169) has been updated.
To review the status of the request and add additional comments, follow the link below:
http://rovio.zendesk.com/tickets/121169
You can also add a comment by replying to this email.
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Angry Birds Support Team, Feb 03 11:10 (EET):
Hello,
and thanks for contacting us!
News like this is announced at Rovio’s web pages or in a newsletter.
In most cases we will not publish any release dates for the updates before they are ready and available.
This is to make sure we can finalize the updates without external time pressure and because we do not
want to give dates that we cannot always guarantee we will hit.
Best regards,
Angry Birds Team
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>>
>> Soulzero, Feb 02 22:46 (EET):
>>
>> Game & version number (if applicable)
>> seasons
>>
>> Platform
>> Windows Phone
>>
>>
>> Message
>>
>> When are you going to release Angry Birds Space, Seasons & Rio for Windows Phone7 ?
>>
>> ~Thanks,
>>
>>