Add Injury / Prospect sections to lineup page

I noticed the addition of an injury and prospect roster spot … how do those spots work exactly and what is their impact to the salary cap and roster spots?

Injury Spot - For example, I moved Jamal Murray to my Injury spot but what are the implications of that vs keeping him in a regular bench spot?

Prospect Spot - Who qualifies for this? Is it just players in NCAA / international / G League?