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Flash Builder 4 does not come with AIR 2 SDK. You need to download it from Adobe labs and overlay the same.
Is it the same for Flex Builder 3?
Also does any of them (Flash Builder 4 or Flex Builder 3) come with an older AIR SDK (AIR 1.5 or AIR 1)?
The SDKs you get from Adobe (unless specified) come with Air 1.5
If you want the Air 2 beta SDK (http://labs.adobe.com/downloads/air2.html) You have to get the Flex SDK of choice (http://opensource.adobe.com/wiki/display/flexsdk/Flex+SDK) and the Air 2 SDK. You then overlay it on the Flex SDK (Using the instructions from the previous post)
Keep in mind that we have no idea when Adobe will decide to release Air 2, so if you are developing for it, you might have to wait on your release until they are ready. On top of that, you cannot have a user auto-update from air2beta to air2release. Basically, you can only "play" with it for now