My two cents to this.

...coming December

is also used if I'm talking about December 2014 right now

I also agree with this December which means the same. Mind it that if this month is December, 2014, we say 'next December' to talk about December 2014

My two cents to this.

...coming December

is also used if I'm talking about December 2014 right now

I also agree with this December which means the same. Mind it that if this month is December, 2014, we say 'next December' to talk about December 2015