The composer of the TF4 soundtrack (Steve Jabblonsky) has announced that they will be trying to get a Score out (he says the word "Soundtrack" but that a Soundtrack is usually just the songs, and he would be referring to the music he composed).

Since we didn't get a CD release of the TF3 Score (it was available online though), I'm not holding any hopes for this one coming out either as a CD.
(we haven't even heard of a Soundtrack CD coming out this time either)