From the FAQ:
Q. Will MechWarrior® Online™ have persistent character content such as leveling or upgrades?
A. Yes. One of the customizations in MechWarrior® Onine™ is to train your pilot to suit your play style. Pilots will bring their efficiencies to whatever BattleMech® they get in.
From the Developer Q&A:
"Is there any particular aspect of the combat which you felt needed to be radically revised and/or updated?"
"[PAUL] To touch on David’s comment, we are also bringing in the ability to skill up your pilot. Your pilot is the actual avatar sitting in the cockpit. The dude or dudette that you’re viewing the world through. This brings a whole new level of pilot awareness to the battlefield and you’ll be hard pressed to see why it wasn’t included before. You will be able to fine tune your pilot’s skills into one of the various roles we have planned for MechWarrior® Online™. This includes scouting and commanding for your team mates."
Now how exactly this will affect gameplay is unknown, but the fact that your pilot is an avatar that can level up over time or specialize in some skillset implies that the RPG elements will affect gameplay.
Edited by Cyttorak, 04 December 2011 - 05:53 PM.