Questions about nRF9160 revision2

[Yusuke]

I have some questions about nRF9160.

1. What is improved comparing to revision1? Only power consumption?

2. Is GPS sensitivity improved? In revision1, it is poor.

3. In which DK version revision2 is populated? Where can I buy it?

4. If you certify a device which populates revision1, do you have to certify again if you switch from rev1 to rev2?

[_r_y_a_n]

With respect to your question number 3:

During this webinar today they mention (at minute 34:30) that for the Revision 2 of the device, the development kit needs to be version v.1.0.0 

https://webinars.nordicsemi.com/the-nrf9160-sip-and-its-location-1