No worries. It'll be back up soon.
Something similar happened with PirateBay, too.
Even then, the "new" MegaUpload would have nothing that the "old" one did. All of the data is lost forever.
When Pirate Bay got seized, nothing was actually lost.
That's primarily because TPB doesn't actually store content, but rather acts like a indexing service for the torrent P2P networks. They'd have to seize everyone's personal computers who are seeding to truly shut down TPB lol.