This is huge. Not just for Rocket League players but all X1 owners in general. The ability to cross-play is honestly a big step forward for them. Games like FFXIV didn't come to X1 because of the cross-play disagreement. Now X1 will have access to more games, not to mention be able to enjoy Rocket League even more!
"Rocket League players on Xbox One will be able to play matches against PC gamers, with "an open invitation for other networks to join later," Microsoft announced this morning as part of an overall initiative to open Xbox Live up for cross-platform multiplayer across all services."
-This gets 2 thumbs up from me!
Although now Vivster and I have to find something else to make fun of.......