Transformers 4's crew will arrive in Chicago this June, filming will start in July and it will last through October, Reel Chicago reports. This doesn't mean that filming will not begin in May though, like what was previously reported. May and June will most likely be dedicated to smaller scenes and sets. The production schedule nor the cast is yet complete, but Chicago location scouts have been hired. Transformers 4 is still scheduled to hit theaters June 27, 2014.