Towards the end of August we announced that Status IDs would be
changing on September 21st.
Due to the release of #newtwitter we are going to postpone that change
until 10am PDT/5pm UTC on Tuesday October 12th 2010.
The original announcement along with more information can be found in
our Announcements archive:
http://groups.google.com/group/twitter-api-announce/browse_thread/thread/7982e3b037eeef95
Best,
@themattharris