There wont be any new content in said patch, but a few changes and improvements are expected, though DICE has yet to reveal any of them.
On the custom game end, the Armored Kill mode is currently available. This variant of Conquest puts great emphasis on vehicles, and disables the Scout class. Another custom mode in the pipe is called Bleed Out, due to go live on January 18.
Bleed Out is a custom version of Rush that decreases the spawn time after death, but turns off regenerative health for everyone.
Bleed out sounds like it will be fun, but only if vehicles and explosives were off. Vehicles will just dominate bleed out, and people could just mortar spam to win.
I like the idea of Conquest without scout classes, but trying to force vehicles on people not so much.