What is the general understanding of the following specs on the gn 3? 1. Will the screen be higher resolution than the gn 2? 2. Will the battery be changeable? 3. SD slot? Many thanks for any thoughts on these points? I am aware that no one knows for sure. The big decision for me is the changeable battery. My current droid Razrs battery is failing rapidly after little more than 18 months. I am upgrading to the gn 3 very soon.