User blog comment:Blv08/Just Dance 2015 All Mashup Proofs/@comment-24519445-20150102114939

Actually, there are 6 confirmed monthly mashups:

Bad Romance (October)

Addicted To You (November)

Ain't No Mountain High Enough (December)

You Spin Me Round (January)

Fatima (Unknown)

Macarena (Unknown)

So all 6 unknown songs are going to have a mashup (maybe)