Well not back just yet, but it will be online pretty soon.

Here's the Large Hadron Collider's official website, with repair status-
http://lhc.web.cern.ch/lhc/

As you can see, half of the ring is well-chilled, and they are predicting to be operational by autumn. Hopefully they can be at full power before the end of the year.

The unofficial promises by a lot of respected scientists is that we might be getting some very real alternate dimensions/universes once they are running.