Since I haven't seen a thread about this yet, Infinity Ward has announced there will not be a League Play playlist in Ghosts. Instead, they're replacing the playlist with a "Clan vs. Clan" playlist, which allows you to play with your clan members against other clans. This will have a separate leaderboard, and IW will use the leaderboard to determine which teams will qualify for the CoD: Championship in 2014.
Source
Here a video from Optic Nadeshot, giving his opinion on the announcement from the perspective of a pro CoD player.
Thoughts? Being a PC guy, League Play is almost nonexistent on the platform because our community is a fraction of the console community. This has partly caused me to move on from the CoD series, with no intention of buying Ghosts on any platform when it releases.