Indeed, MW had some minor patches, only bug fixes really, and ow yeah chat in lobby, wich is pretty standard for any game, also they planned to have map editor in release, because if they found it otherwise a little bit of a rape-off, but due to lack of time and money or something, always same story, they released it earlier and they kind of promised map editor to come later soon.
And well, it didn't come yet. Also they have sticky about power-ups wich you have undoubtly noticed, so far we had none, zero, no new power-ups at all, I'm not really intrested in power-ups anyway, but still, this whole fuckin topic is about the future of this game, but IV lacked the intrest from the get-go to really go further with it, if you ask me.
Besides, I don't know if you bought this game or not, but you shouldn't because almost no one plays it anymore, and in a year it'll be completely forgotten and I'll cry everyday.
HELL YEAH even EA does better job for keeping there games alive.