Board Thread:Questions and Answers/@comment-13600668-20130727173812/@comment-3361105-20130727174352

There WERE 52 Earths, then Flashpoint rebooted the timeline so that DC could relaunch its line with 52 all new #1 issues.

The 52 in "New 52" refers to the number of titles, not the universe. There may BE 52 Earths in this new DC Multiverse, but so far, we have only seen 4 of them that I know of. Prime Earth, which is where the mainstream books are set; Earth 2, which is where is set; Earth 23, which appeared in Action Comics; and whatever universe Superdoom comes from.