Is there a rear facing camera?
Nope, there's only front facing camera, but it's not a requirement for mixed reality to my knowledge.
Here are the minimum requirements, got them on VRHeads:
CPU: Intel Mobile Core i5 (e.g. 7200U) Dual-Core with Hyperthreading equivalent
GPU: Integrated Intel® HD Graphics 620 (GT2) equivalent or greater DX12 API Capable GPU
RAM: 8GB+ Dual Channel required for integrated Graphics
HDMI: HDMI 1.4 with 2880x1440 @ 60 Hz HDMI 2.0 or DP 1.3+ with 2880x1440 @ 90 Hz
HDD: 100GB+ SSD (Preferred) / HDD USB: USB 3.0 Type-A or USB 3.1 Type-C Port with DisplayPort Alternate Mode