Please find the list of Intel graphics and the number of supported displays here
Note that the HD 4000 from our internal testing it can only support 2 independant displays. If you place a MST Hub on each DP port it will clone the displays. On the HD 4600 or HD 5K series we have tested and it works with 3 independent displays.
1. If your laptop use the Intel HD 4000 you will not be able to drive 4 independent displays
2. The MST Hub is a DP++ device, active or passive converters will work on the MST Hub
3. No, you do not need active converters. For the VGA is a very different story as the conversion needs to be active. For DVI, HDMI passive converters are ok to use on the MST
4. No, it does not require drivers.