WizKids has shared news on its first and second Marvel Dice Masters releases and plans for organized play.
The first release, Marvel Dice Masters: Avengers vs. X-Men, has sold out prior to release; a reprint will be available in late May or early June. 
Currently, while the game is new, stores are encouraged to run their own in-store play tournaments, and WizKids has provided an online help guide and results are reportable to the WizKids Events System.
In June, stores can offer Marvel Dice Masters: Avengers vs X-Men Storyline Organized Play, which will be supported by a six month program of OP kits.  The kits will offer both competitive and participation prizes including alternate art cards and new cards for players’ existing dice.  In month six, a unique card and dice combo will be offered as grand prize.
WizKids previewed preliminary box art for Marvel Dice Masters: The Uncanny X-Men at GTS last month while demoing the Avengers vs. X-Men release (see "'Marvel Dice Masters: X-Men' and 'Play Mat'"), but details were not finalized on the set.  The new set, which will come in both starters (MSRP $14.99) and boosters (MSRP $0.99), will feature Wolverine, Magneto, Cyclops, Iceman, Psylock, and the Sentinels among others.  The planned release date is Fall 2014.

For some previously unrevealed images from the new game, see "Preview: 'Marvel Dice Masters: Avengers vs. X-Men'".