Besides the typical characters and skins, Warner Bros and/or NetherRealm snuck in more stuff into the game's microtransaction system. Was only discovered after launch and now includes the ability to purchase packs of Easy Fatalities and an accelerator to get everything unlocked at once (costs around $20).
PS4 and Xbox One version has this system while the PC version doesn't (or at least for launch). Same Easy Fatalities packs are said to be found in the Krypt for the non-real cash option, just takes longer to purchase and use them.
Not sure if the PC version is affected but some complaints about the game locking you into whatever server/region the digital game was purchased in. So if you bought the game from UK/Europe's PSN, can't play online with people from US or other regions.
http://www.neogaf.com/forum/showpost...postcount=1404