Just saw Leonard Nimoy on Piers Morgan
. He sounded like his usual self and looked pretty good, a far cry from the sickly man in the wheel chair that we saw in the pic when this was first announced. Hopefully the interview will pop on the 'net in the next day or so.
He says that he carries around a machine that extracts oxygen from the air and he finds that he needs to use it a few times a day whenever he can't catch his breath.
[Edit] Here's an article and a clip