Just an update to mention that the Biggest Loser episode with the contestants walking out is tomorrow night, Tuesday April 17th at 8 PM. Like the last couple of episodes, The Biggest Loser has been cut to an hour this week and they have been showing the first half of an episode one week and the second half the next week. I'd expect the walkout to occur late in the episode tomorrow night and act as a cliffhanger for next week when it gets resolved. From the promos, the producers are embracing the walkout ("You've seen it in the news") rather than covering it up.
As far as spoilers go, I haven't seen anything new since I originally posted this. It still looks like Mark is gone but the other eliminated person isn't known.