Another Update:
Just wanted to pop in here and tell everyone that as of yesterday, by popular demand, the PC version of MKX has been brought back from the dead. Literally. Not only does it run 10X better than it did before, it also has all the aforementioned new content and improved netcode included in MKXL, which means it's pretty much FINALLY on par with the console versions of the game.
If you still haven't had a chance to buy and/or play Mortal Kombat X yet, now would be a perfect time to do so! Here's the Steam page:
http://store.steampowered.com/app/307780/