I suspect that the new progression trees (which will still be in the game) will be larger for the low tiers, as there will no longer be tiers. For one thing, they will have to be.
Too many secondary weapons are not available to the lower tiers (burst rifle) so in the revamp, I would not be surprised if our current t1 trees become three times as long as they currently are.
---------- Post added 2013-03-15 at 09:02 PM ----------
I suspect the game will become like league now in terms of suits = champions.
The thing is, they can thrust "balance" partly onto the player. Some suits will be good for world pvp. Some suits will be good for capture the point. Some suits will be good for capture the flag. Some suits will be good at death match. Some suits will be good at convoy. Some suits will be good at arena. Some suit will be good a 50v50 matches. Knowing what suits are good at what will become part of being "skilled" at the game or map or suit.
By not forcing us to do 1 type of pvp for the best gear, players will minmax for each map.
League creates its own balance problems not by having 100+ champions but by having a limited number of maps. When they added dominion, many champions that were 'meh' at 5v5, the main form of league, shined and shined hard. If league had gone on to make 4 or 5 different maps with different objectives, different champions would have excelled at them.
You can only balance diversity of classes with diversity of game play.