While details are sketchy at this point, the Battlefield 3 version for iOS is expected to be much like the Battlefield: Bad Company 2 release. Theme Park apparently will be a new version of the amusement part management simulator that was very successful back in the day. Theme Park is a good choice, as many simulation offerings seem to be very popular on the iOS platform.
No official release date was offered beyond the statement that it will be released later this year. Both titles are said to be playable at the upcoming Gamescon event that starts next week.
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