Thanks to Henry Spivey for sending this to us.
A couple of really big spoilers have been found on the internet over the last week or so in various places like Reddit/4Chan. Here is a big spoiler for the end of tomorrows episode.
Only read if you REALLY want to know what happens.
Merle goes on a suicide mission to try and kill The Govenor by luring a bunch of walkers to the meeting place for Rick and The Gorvenor (he had an army almost with him). Merle kills some of the men of the governor by shooting with his assault rifle, and even shoots Ben (Allen`s kid) near his shoulders. But Merle is surprised by an walker who ends up with Merle been found by The Govenor and his people.
He is beaten up, and then shot (and killed) by The Gorvenor. Darryl out looking for Merle finds him in the meeting place, as a walker. Darryl kills his own brother in walker-form. Episode ends.