Rumorville:  Nikolas makes a vow to Britt.

Carly tells sleeping Franco her thoughts; Franco wakes up. How much did he hear?

Franco offers to donate bone marrow but not before a mysterious donor (who matches Danny) offers to do the same. (More likely than not, he is Sam's bio-dad.) 

Later, mystery donor meets up with Ava who warns him it is dangerous for him to be in Port Charles. Will he, therefore, keep his contribution to Danny on the down-low, and allow Franco to take the credit?

Donor man hangs out in the hospital and offers Sam a sympathetic ear on the roof as the procedure is being done.

Mystery guy hangs around Port Charles, keeping an eye on Alexis, Ava, Kiki, and Sam. Expect him to interact with Anna, among others.

Down the road we may discover that RH's "Franco", is Heather's son. Was he ever the "Franco" we knew to begin with?

It won't be too long before one of Felix and Taylor's parents make an appearance.