MY INTERPRETATIONS!
- M-Sharpedo's Torpedo Dive - Does 40 damage to 2 of your Opponent's Benched Pokemon. (Don't apply weakness and resistance)
- M-Camerupt's Magma Eruption - Discard top 3 cards of your deck. This attack does 120 damage for each energy you discarded.
The M Camerupt move makes a lot of sense, that is exactly the sort of attack you'd expect from a fire mega, it's all about the discard and the energies. People may do some sort of pairing with him and Typhlosion, although that is a lot of deck space to take up... Either way, the possibility of doing 360 damage or even just 240 is quite powerful, and obviously Blacksmith can just get those energies back for you.
As for M Sharpedo, that seems a lot less impressive, and I don't see people making use of it. Sure, it could be paired with the likes of Alakazam EX and Gengar, but would it really be worth the effort? For a mega attack, it seems super weak, especially considering that Magnezone EX has an attack that does 50 damage to 2 opponents pokemon. Magnezone EX should not be stronger than Mega Sharpedo EX.
I like Sharpedo EX and I still use it in some of my Dark decks, but I doubt I'll be making room to fit in the Mega and the spirit link, it doesn't seem worth the effort.
In saying all that, the artwork looks pretty nice, so at least they won't be an ugly addition to the collection.
EDIT: If M Sharpedo has no retreat cost, it may change my opinion on the usefulness of the card. Gotta love your zero retreat Megas(Manectric and Beedrill, etc.)