Is it possible that Rakki N.V. never owned satoshidice.com domain in the first place? The domain leased out to Rakki N.V. who hosted the game with Satoshidice brand. Later the owner of the domain gets a better deal from bitcoinvideocasino, and Rakki N.V. moves out to a new domain with Megadice brand?
This is the best theory so far. It explains that there was no need to move the cold storage too.