Big question, looking for legitimate answer

(This is mere speculation)

Blizz is likely to be bot-paranoid (or they should be). I would expect a similar approach like D2, with a maximum of 4 connections per IP address.

By 4 connections, you mean like 4 people on the same server at max?

No, we mean 4 simontaneous UDP connections to the server.

Zagggon what they mean is that you will be able to have atleast 4 people playing with diff cd's on the same ip address, or am i mistaken?

Basically, a cap of 4 connections per IP address, irregardless of how many valid CDKeys/etc...

That's my guess, as that's what they did with Diablo 2.