That's not necessarily a bad thing. The Xbox One controller is one of the best examples of a console controller in recent times, so much so that even Oculus will be using it with the consumer version of its Rift VR headset in 2016.
The first thing improved with this version are the bumper buttons. Microsoft says it has "fine tuned" them for better performance along the full length of the buttons, and honestly, they do feel better to use. You get a pretty even 'clickyness' along the entire length which is probably what Microsoft was shooting for.
The other outward facing change is the addition of a standard 3.5mm headset jack. This means you no longer need to purchase the additional adapter to use anything but the stock Microsoft headset. This is reflected in the new offering that Microsoft includes in the box with the 1TB Xbox One, opting now for a 3.5mm toting option over the Chat Headset that has been included previously. You can still use the adapter if you like, along with its additional volume controls.
The rest of the changes are internal. From Microsoft:
"With the updated controller, in addition to the volume and mute controls on gaming headsets, you'll also have the option to adjust headset volume, mic monitoring, and voice and game audio balance through the Settings menu on your console. We've also improved the quality of audio coming through the controller and increased the maximum audio volume on headsets used with this controller, based on fan feedback. And we've enabled wireless firmware updates on the updated controller which eliminates having to connect the controller via USB cable to receive updates."
So, lots of good stuff underneath, not least no longer having to dig out a cable to install firmware updates. It's a nice refresh of an already great controller, just don't go into it expecting more than there actually is. It'll be available in black or in the special "Covert Forces" silver and black camo edition, which looks pretty fancy from the pictures we've seen so far.