Samsung just unveiled the Galaxy Ace 4 with a 4.5″ display, 1.0 GHz dual-core processor and TouchWiz Essence interface on top of Android 4.4 KitKat.TouchWiz Essence is a simplified part of the TouchWiz interface that should that we’re yet tosee explained.The Samsung Galaxy Ace 4 doesn’t tread away from the usual Ace design language but…