I have to give DC Comics a lot of credit. They made what I (and many other people, including the writer of the comic himself) felt was a bad decision when they announced that the Final Crisis hardcover would not include the Superman: Beyond two-parter that ended up being almost absolutely essential to the final story (not absolutely essential, but close to it).
They have now fixed their original mistake, and the Final Crisis hardcover WILL include the Superman: Beyond two-parter AND the Final Crisis: Submit one-shot. The only part missing now is the Last Rites Batman two-parter, and that's far from essential reading (and it was already reprinted in the Batman R.I.P. hardcover)
Congratulations, DC! You did done good.
Tip of the hat to Rohan Williams.