Both the 2012 and 2013 versions of the Nexus 7 have a claimed battery life of 10 hours. Real-world use by some reviewers though have put it closer to 7 hours.
It should be able to. Wifi connectivity isn't restricted by geography.
It should work for the Nexus 7, as it works for newer Android smartphones. As for the iPhone 5, you will need an adaptor to use a HML to HDMI as it doesn't use micro USB.
Ipad.
The initial release of the 2012 Nexus 7 did not have the camera app installed, but future OS updates should have installed the app. If one still isn't installed on your Nexus 7, you can download a third party camera app, and it should function the same way as a smartphone camera app. The 2013 Nexus 7 should have the camera app pre-installed.
There are various types of Nexus devices, but the Nexus 7 is part of that same family.
The 2012 Nexus 7 came out on July 2012. The 2013 Nexus 7 came out on July 2013.
From what I see, it seems to be only available for Samsung tablets and only in the Samsung website. However, since it requires Android OS 2.2 or newer, theoretically it should be able to work on any tablet with Android, including the Nexus 7. What you could do is try to download the app with the Nexus 7, assuming of course it will let you download it with a non-Samsung device.
A long press of an image will give you the options box. Pick "Save image" and it will save into the Nexus 7's Gallery.
Probably you should ask yourself if specs are more important? Is storage more important? As devices are moving more and more into the cloud, and the typical Nexus 7 is wifi only, getting the newer, better spec'ed 16 GB Nexus 7 would be the better option. However, if you value storing files such as music or videos more offline, then the original Nexus 7, which still has decent specs to hold its own, is another option.
If you need a small tablet then yes!
No, it won't. The original Nexus 7 only allowed for micro USB charging or use of a dock to connect to the docking pins.
Yes, the Nexus 7 (2013) is Bluetooth Smart Ready certified. The 2012 Nexus 7 supports traditional Bluetooth.