Each WOW realm server is actually four servers, the eastern Kingdoms, Kalimdor, Outland, and Battlegrounds/Instances are all housed on different physical servers. This works out to about 1200 servers, and presuming they add a fifth for the Northrend continent in the expansion we are right near to 1500.
I'm sure diablo and all other battlenet infrastructure will probably be upgraded with WOW's old servers.
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I'm sure diablo and all other battlenet infrastructure will probably be upgraded with WOW's old servers.