Hybrid Electric Humvee

A more likely replacement:

US Marines RST-V Hybrid Tactical Vehicle

A short history of the Army's Shadow RST-V - AutoblogGreen

Army Technology - Shadow RST-V - Reconnaissance Surveillance Targeting Vehicle

This thing has 4 wheel sterring that allows it to turn 360 degress nearly within its own body length.

 

The DRS/TARDEC vehicle is just a technology demonstrator - it won't go into production.

The RSTV article is almost 4 years old.

Here's one likely HMMWV replacement

Defense Tech: BAE/Navistar JLTV Prototype Unveiled