I'm not exactly following the OP's question.
If the district currently exists, there must be a MOC to fill it. If the district is newly created and WILL exist after the November elections, then it doesn't yet exist. That means the new MOC who fills that district won't take office until January 2013. Thus, you apply to the current MOCs in the current districts.
It's the same as "what happens if my MOC is defeated in November?"
Because slates are due Jan. 31, in virtually all cases, the current/sitting MOC submits his/her slate of nominees before leaving office around Jan. 21. MOCs for newly created districts won't take office until that date.