Gmail's translation messages include a lot of references to features that were tested and might be released to the public. Among them:
* Skip spam classifier as an action for a filter.
* Information about your login: "This account is open in N other locations", "Last account activity".
* Attach inline images.
* View attached images as a slideshow.
* Multi-user conversations in Gmail Chat.
* Integration with AIM in Gmail Chat.
{ Via Google Blogoscoped. }