In case you didn't see in the other thread, they announced a Showcase for Amethyst:

DC Universe titles coming in September 2012:

SHOWCASE PRESENTS: AMETHYST, PRINCESS OF GEMWORLD VOL. 1 TP
Writers: Dan Mishkin and Gary Cohen
Artists: Ernie Colon, Ric Estrada, Pablo Marcos, Alex Saviuk, Bob Smith, Gary Martin, Romeo Tanghal, Kurt Schaffenberger and Karl Kesel
Collects: LEGION OF SUPER-HEROES #298, AMETHYST, PRINCESS OF GEMWORLD #1-12, AMETHYST ANNUAL #1, DC COMICS PRESENTS #63 and AMETHYST #1-11
$19.99 US, 648 pg

That's a LARGE page count for a Showcase.  And they didn't mention that George Perez does some of the covers.

As I said earlier, this will really suffer from the lack of color (all the colored gemstones and their families), but still it has some great stories.