Apparently, Ubisoft are gearing up for a new free online game; their Facebook page (and Twitter) shows a new picture with the caption "Might & Magic: Duel of Champions. The online card game".

There is no news on exactly when this game will be released, but an official site has been set up, containing basic introductory info to how to play:
Might & Magic Duel of Champions is the free online card game set in the fantastic Might & Magic universe. Choose a hero and build his army with Unit, Spell and Fortune cards to defeat your opponents in epic card battles. Experience the time-tested factions of the Might & Magic universe in a completely new format. Discover a wealth of beautifully illustrated game cards, featuring all the well-known characters, spells and heroes from the Might & Magic series of games.
The site also contains this video:



It would thus appear that the previous speculation about the registering of a "Duel of Champions" domain were correct. Perhaps, then, the speculations about Raiders are true also?