Has significant changes to the engine and certain parts of the gameplay. Some features from the sequels were ported over. This however is not redesign of original Dark Souls, so many of the problems of the original are still present. The assumed goal however of this product is to move support to unified game across all current supported platforms and allow players who never played the original to experience it.
There's been some severe outcry from PC Dark Souls fans for the remaster not doing "enough".