Mysterious Treasures is a great name for the set. Also going to be a great set if the spoilers are mainly right.
As for the Shining Darkness spoilers, well, it will be a great set if ANY of those spoilers become the actual cards. Even Dialga Lv. X is quite good, but I'm most interested in the Ampharos, Gallade, Raikou and Arcanine (but only if new cards come out to get it back into your hand) as they will be in some of the next formats great decks.