The official NieR Re[in]carnation Twitter webpage released a few tweets for the game with some unique art for it. All of the art and descriptions are below.
The World of NieR ①: 2003 A.D.
A white giant and a red dragon suddenly appear in Shinjuku. After they battle, an unknown particle called Maso causes a strange disease to ravage the area.
The World of NieR ②: 2016 A.D.
As the infected grow violent, countries around the world strengthen their militaries in response to the threat. Meanwhile, a Japanese research facility begins to study Maso, as well as possible weapons based off it.
The World of NieR ③: 2053 A.D.
Project Gestalt is launched to combat the disease. Human souls are separated from their bodies, but soon thereafter grow unstable, run amok, and perish. Despite this, a stable consciousness is eventually found that allows the project to proceed.
The World of NieR ④: 3470 A.D.
The original Gestalt dies.
Project Gestalt fails.
The World of NieR ⑤: 11937 A.D.
Unidentified objects emerge from outer space and begin deploying weapons known as machine lifeforms. The androids now living on Earth retreat to a space station known as the Bunker and begin work on a line of combat androids called YoRHa.
The World of NieR ⑥: 11941 A.D.
The first combat operation is carried out by the experimental YoRHa units. Ultimately, all but one of the sixteen units are destroyed in battle.
The World of NieR ⑦: 11945 A.D.
Despite the fall of the Bunker, the android army successfully destroys a large-scale machine lifeform facility, and the 14th Machine War comes to an end.
The World of NieR ⑧: [YEAR REDACTED]
The existence of a space containing endless rows of massive structures is confirmed. Information on the precise location and temporal axis of this space, now known as The Cage, is not made public.