From what I've seen of the current maps (in gameplay trailers) and if their premise holds true for all future maps, then the Clanner's notable range difference will be diminished (not eradicated). Even still they will launch (come March 2013), with harder hitting weapons that weigh less and frequently take less criticals. This includes things like Ferro-Fibrous and Endo-Steel construction techniques which take significantly less criticals than their IS equivalents, and XL engines which won't kill a clan mech losing a side torso (as IS equivalents will). While they may generate more heat (not always true), they have surplus tonnage, criticals, & smaller double-heat sinks that make up for it. A distinct clantech advantage with much higher access to all of these better technologies (even Solohma mechs). Some balancing mechanic is required for the prosperity of MWO.
Just going by the numbers of mechs won't work (It's an idea I've suggested before, but now disagree with). It doesn't take into account the unit compositions, nor does it factor in for the diffusion of new & clan technologies into the IS over time. Battle Value however does! Thank you those people that brought it up, It will match sides most accurately. Earlier in the invasion IS will have more mechs while later when the technological advantage of the Clans has diminished it will still match up as evenly as possible. This also avoids the problem of having some players paying for an unfair advantage. It's canonicaly correct, and accurately balances IS vs IS \ Clan vs Clan too.
Wanted to address a post made while I was posting this.
I don't think having the IS with all the newbloods, and the Clans with a guarantee of great players only is a good idea. I think the reasons why are pretty obvious.
Edited by Reoh, 29 June 2012 - 08:21 AM.