In these leagues, Random Debuts is enabled by default, which means any real players not on the initial teams will be randomized into future draft classes. If you want to disable this and have future draft classes full of randomly generated players, you can by clicking "Customize Settings" and changing the "Randomization" option.| zengm.com
Create leagues from a mix of teams - random teams, real current/historical teams, and teams from your existing leagues| zengm.com
Randomization - This is the only option that's not new, but I'll still explain it here for completeness. You can choose to "shuffle rosters" (randomize which players are on which team) or choose "random debuts", which is a very fun feature. Random debuts means every player's draft year is randomized. Starting teams are random combinations of current and future players, and future draft classes contain a random selection of real players.| zengm.com