Good to see that the 100 will finally allow teams to replace their centrally contracted player in the event of said player being unavailable (whether due to injury or rest or England duty).
Given that such a player is essentially a bonus extra player, it's always been a massive advantage to those teams who have had their centrally contracted player available for the whole competition.
The ability to replace them with an overseas player, and offer said replacement the top bracket salary, opens up the possibility of being able to field three top bracket overseas players.