My interpretation of what JDB said about the new depth chart is that you won't be able to put a CB into the depth chart at DE/DT based on player physical weight.
As long as you can change a players position...i.e. TE to RB or LB to CB then it's all about the player getting "to weight" before he can play at the position.
This isn't much different from what I implemented in several of my leagues except now the league admin doesn't have to check every team for compliance.
You make a drafted TE a RB and he needs to lose 20 pounds or so he can play at RB and the change will be he can no longer play TE plus no more WR at TE which is probably the biggest current exploit in the game.
It will be interesting to see what the qualifying weights are to play TE, DE or LB. I'm assuming he uses the current minimums of 240 for TE, 265 for DE and 237 for LB but I will be asking JDB if that's the case once the new UI is implemented.