Why dont you stay on the dice game first, after being successful then you can add more games. With my current view, I just saw your dice game does not even have huge traffic, although your competition is a big success but you really need more players again. But this is from my point of view, so if your team are going to add this game so fast then it is your choice then
Success is subjective, any sites has their own goal of success. Maybe they think that it is now good time to expand the business with new game, why not? As long as it does not give bad effect to the first game then I think it is OK. Adding new games can be done anytime as long as they are ready, adding new game may give more traffic as well IMO. As long as the new game is attractive and unique then it will be a great addition, otherwise if it is like a "in a hurry" addition then I dont think it will be a good move.