1. The new rule does not go into affect for high school kids until the NBA gets rid of the one and done rule. Until that happens, it is still against the rules for high school recruits to sign with/receive benefits from agents.
2. Once the rule does go into affect (which probably won't be until 2022 at the earliest from what I have read about the NBA changing the one and done rule) only the players that are dubbed "elite" by USA Basketball will be allowed to sign an agent on July 1 before their senior year. This will only be about 10-15, maybe 20 players at most, a year. There won't be 100 high school recruits signing with agents like most are envisioning.
3. Once a player is allowed to sign with an agent, that agent must be registered and certified with the NCAA. That agent is only allowed to pay for travel, meals, and lodging for the player or family that is directly related to the draft process for the player. That means meeting and workouts for teams. No 200K cash payments or Benz's allowed.
Even if the NCAA wanted to point to these new rules as an excuse for not punishing past infractions, they can't. Under these new rules, everything teams like Kansas, Louisville, (probably) Duke, etc. have done are still considered major violations. If anything, the new rules about the NCAA using the info gathered by outside investigations (FBI) and increasing the severity of punishments (5 year post-season bans, lifetime bans on coaches) means the teams that are currently being investigated should be really nervous about worse consequences than they originally thought.