We are focused on getting XT out the door, so we aren't working to make any other snapshots ready to be announced in the remaining 12 days before the two-week fair warning requirement leading to Day 200.
That said, there is nothing to stop independent developers from making such an announcement whenever they please.
As far as AGS donors are concerned, Day 200 might as well be...
The Snapshot at The End of Time
(http://rhrealitycheck.wpengine.netdna-cdn.com/files/teaser-images/2012-12-21-Earth-375x250.jpg)
for every remaining BitShares DAC that will ever be released. Since nothing about AGS will change after that. Day 200 is the terminal AGS snapshot - regardless of when subsequent DAC snapshots may be announced.