Gameloft has released a new preview of its upcoming game Hero Sparta II for the iPhone and iPod touch. The preview, which can be viewed on YouTube includes the full opening cinematic trailer from the game as well as the first in-game images to be released. First announced last month, Hero of Sparta II will be a sequel to Gameloft’s highly-acclaimed Hero of Sparta. Few additional details have yet been announced beyond the preview, and no mention…