It is common for the NFL to make tweaks to rules at the Spring meeting of the owners, and this year is no different.
Per Mike Garafolo of the NFL Network, these rule changes governing IR & NFI were adopted this week by the owners:
Rule change #1
Teams will be able to designate up to 8 players to return from the IR and NFI lists this season. This represents a continued loosening of the regulations that dates back to 2012. Before 2012, players on IR were ineligible to return for the whole season after being placed on injured reserve.