We will test Streaming API Tweet Annotation as early as next week - June 7th
through June 11th. All streaming clients, including user streams preview
clients, should expect empty annotations and the rare populated annotation
during arbitrary test periods. Assuming general stability, on our end and
yours, we'll eventually leave annotation delivery turned permanently on.
General purpose JSON and XML parsers should experience no problems with this
Expect a further announcement just before we flip the switch for the first
Infrastructure, Twitter Inc.