So the new ipod touch has around half the battery capacity of the new iphone (1043mAH ipod6 vs 1810mAH iphone6) and almost a third that of the iphone 6 plus (2915mAH)?
I will likely buy one in the next few months to replace my dying touch 4, but it will be a minimal upgrade. It will be faster, better camera, and won't crash as much, but the only real new feature will be Siri. The iphone6 is plenty lightweight and thin with 1810 mAH battery. I would have loved a beefier battery in this, or if they released a "touch" for $199 and "touch plus" for $299 or so with big battery and a GPS.
I will just be buying a protective case with extra battery built in (and possibly gps but these are ~$100!) which kind of ruins the asthetics, but Apple refuses to ship decent batteries in the ipod line.
(Also, people are missing the picture on battery life.. its not the CPU that eats power, its typically the display, whether you are talking about laptops, phones, tablets.. Hence why the 6plus has a ~50% larger battery than the 6 but gets only 1 more hour of wifi internet browsing (12 vs 11 hours).) The specs are identical except for the screen, it just needs all that juice to run the larger screen for the same amount of time.