Who is Michael's roommate in the hospital?
There is already heated debate as to whether or not this is Old Man Hanso here. It's interesting that TPTB would linger a shot on a neighboring patient if it wasn't important, or at least the kind of "gotcha" easter-egg moment that LOST is known for. Some viewers think it looks like Hanso, and the naysayers are already getting upset about it for some reason.
I think that it could very possibly be the same actor. The brow, temples, hairline, nose bridge with downward slope, and nostril curve, are very similar to Ian Patrick Williams' features. I'm a portrait artist, so I'm good at matching subtle facial features at various angles. But the big "tell" here would be the ears. In forensic portrait science, the ears are just about as unique a feature on a person, as their fingerprints. And like fingerprints, the overall form of the ear cartilage does not change with age (they just get longer), so ears are an excellent body part for identifying missing persons after many years, etc.
The good news is, "Hospital Bed Man" has a very unique and definitive ridge down the edge of his ear from top to lobe, that can be seen clearly in the episode cap and that would make an ID very simple. The bad new is, I can't find any clear images of Mr. Williams' ears online! But I'm working on it. Here are some samples so far (the Sri Lanka film is useless BTW):