Do you know how many apps and websites (google.com, for example) use location based services? Not to mention geo-tagging photos, using iHeartRadio, or 100s of other scenarios I can think of where you would need GPS.
It will definitely have GPS.
Now the barometer, I have no idea what that's for. Short-term weather prediction doesn't make a whole lot of sense, since you're always connected to the internet for weather.com, etc. Does it sense when rain is coming, and shut down if it knows it's outside? Seriously, I would love to know the thought behind that one.