Yes and no.
They won't appear in the "main" career events (they are scripted to use the tracks from launch), however, they do (generally) add invitational events that use the new track/s.
I see...
Well, I don't have much interest in invitational events (they get tiresome after a while [hell, even the main championships do get, with their frozen formula, the same tracks in the same order, with the same climatic conditions... ]), but thanks!