2.4 leaves hunters low on mana

Since patch 2.4, hunters have been having some problems. Aside from the outrage over the fact that our traps are now announced, we seem to be having issues with mana.

On the forums, hunters are not seeing much love from the non-hunter crowd, but I suppose that is to be expected. It is important to note however, that our mana efficiency is an intended attribute of our class. We are useful, not solely, but arguably primarily, because we can provide sustainable, long-term DPS. No, we don't crit like mages. In a boss fight though, we can keep going after mages short out.

Why are hunters all of a sudden having issues with mana? There are a few theories floating around, but we have yet to be graced with a blue response. Take the jump to learn more about why this might be happening.
http://www.wowinsider.com/page/11/