Treyarch's David Vonderhaar is confident that the weapons will be balanced in Black Ops, saying "This time we have better data," in response to a fan's question about the Spectre M4. For those that don't know, the Spectre M4 is a submachine gun with a low rate of fire, low recoil, and high power. It is similar to the MP40 and the UMP45, both of which were complained about for being "overpowered". Treyarch will also update weapons after the release of Call of Duty: Black Ops if they are not balanced.
Twitter question: http://twitter.com/#!/DavidVonderhaar/status/27643021406