Whenever they feel like releasing it. If you keep an eye on this forum and the main Universal forum people will generally post to let you know of any specials.
Myself and many others have been waiting for them to release the rates/packages for 2011. Last time I spoke with a rep for Universal (a few months back) they said to keep a look out around June/July, since we are now in July I'm hopefully we'll see something soon. But unfortunately there is no way of knowing.
Best thing to do is just keep checking the Universal Orlando website.