i noticed in earlier Single player footage it used the classic Crysis 2 single energy bar...but i assumed it was because it was an early build...

but now after watching this

http://www.ign.com/videos/2013/02/05/crysis-3-suit-powers-overview

im wondering is the 2 bar system only a multiplayer feature?

It's only for multiplayer, they said it wouldn't work with SP, I think it was the right decision... not sure about the infinite sprint though