From Josh Gross's Twitter page:
Shootin down a rumor. Dan Henderson won't fight Antonio Rogerio Nogueira in his next fight. In fact, his next fight might not be in the UFC
According to a source close to Hendo, Dan is a free agent. The source said Dan wants to remain in the UFC. It makes the most sense.
But as of right now he doesn't have a contract with Zuffa. Negotiations were characterized as “slow.” Dan's main focus is fighting A. Silva.
He'd entertain a fight @ 205 if it had title implications. Source also said Dan would fight Silva @ 205 if The Spider preferred.