There is no word on weather the servers will be through any official set of providers, or if they can be run freely by anyone who sees fit. Activision also said it won't launch the game until a measured and effective anti-cheat solution for the platform is ready, but that the PC game is still on schedule despite that mandate.
If you care to pre-purchase Modern Warfare 3 on Steam, you can now do so. It's an outrageous $100 for Australian customers, but if you apply the VPN trick we've mentioned many times, you can pick it up for $60.