This is a new mechanism to augment the low quality question ban system.

Instead of outright banning users it will rate limit them. I believe the limit may be variable but I have seen a potential of 1 question per week.

The upshot should be that it is harder to get banned by asking questions that are poorly received, the downside is that you are instead rate limited until you gain enough high quality posts.

Just hunting down a link with more information now.