TBV are usually 1 point for every ton. Some mechs get TBV bonuses, some get TBV value penalties. LCTs, for example might be worth 0.75x, giving drop commanders an extra 5 tons.
Clans get a TBV penalty of something like 1.2x; simulating the 2 stars to 3 lances lore system.
Further, a TBV system will let teams dictate their drop deck and allow people to bring more variety to each match.
Currently, we only see a bias towards 'favored' mechs for each weight class--people are going to try to bring the heaviest mediums (SHDs, etc), the heaviest assaults and the heaviest lights to every game.
My thinking is that when matches are being set up drop leaders should be able to choose how wide a tonnage differential to drop against. MM can show the probability of finding a match within a minute. So, maybe the default is to drop against +/- 50 tons, but that can be adjusted with a slider to within +/- 250 TBV or something.
Edited by JHackworth, 06 August 2014 - 10:41 PM.