Looks like the main difference is that since everyone is lining up essentially in the middle of the field, and can’t move until the ball is caught, people aren’t running full speed into each other. This article has a video linked to it:
This “landing zone” is also a big, big deal. Kickers will be incentivized to get the ball into that zone. And penalties only move where the ball is kicked, not the zones, so penalties that are assessed on the kickoff will have more of an impact.