Superman: Doomed and Action 31 have been pushed back to May 14. So Part 1,2, and 3 are all coming out in the same week.
Great for me. I intend to see how the story unfolds (as in, if it has the real ending at opposed to just another cliff-hanger leading to another event) before reading the whole thing. It's easier to wait for the final issue when the leading issues are released just a week before that.
The solicits mention that Doomed leads into "Enemy of the State" in Action Comics and SMWW. Also, Bat/Supes 11 will also be a Doomed tie-ins book.