Here's an excerpt from the Star Trek timeline as posted on Wikipedia:
Wikipedia said:
2151–2155
⦁ The events of ⦁ Star Trek: Enterprise take place.⦁ [27]
2156–2160
⦁ The ⦁ Earth-Romulan War is fought between United Earth and its allies, and the ⦁ Romulan Star Empire. The war ends in a stalemate though the Romulans are defeated at the Battle of Cheron. The ⦁ Romulan Neutral Zone is established.⦁ [1]
https://en.wikipedia.org/wiki/Timeline_of_Star_Trek#22nd_century
The series Enterprise was immediately prior to the Earth-Romulan War. Had the series not been cancelled, we would have presumably had to opportunity to see that war. The first starship named USS Discovery was NX-04. During the episode Fortunate Son, NX-02, NX-03 and NX-04 were referenced as planned, but not necessarily under construction. We later saw the NX-02 Columbia enter service, and the Discovery came to be discussed in the novel Beneath the Raptor's Wing, where it was launched in August 2155 from San Francisco Yards under the command of Captain Curtis. The Discovery became the first Starfleet ship to be lost, destroyed by nuclear weapons launched from a Romulan warship.
The next ship to be named Discovery was a Discovery class science vessel, NCC-100, referenced by the video game Star Trek: Legacy. After that came a Daedalus class science vessel, referenced by DS9 as having been in service in the year 2159. There was also a Constitution class (NCC-1798), Royal Sovereign class (NCC-3008), Nebula class (NCC-62049) and a Steamrunner class. The registry number of the Discovery in the teaser trailer was neither of these numbers. It was NCC-1031. This would place the ship as launched somewhere between the Discovery class (NCC-100) and the Constitution class (NCC-1798), but was not the Daedalus class referenced by DS9 as the Daedalus class is a science vessel of well known design, and the ship shown in the trailer doesn't match that design.
What we have is a ship which is completely unknown, but probably has nothing to do with the Earth-Romulan War, unless by time travel, or by existing in the Abrams universe, thus being exempt from the restrictions of canon. Which, is entirely possible considering Alex Kurtzman, an Executive Producer of Star Trek: Discovery, wrote the 2009 Star Trek reboot alongside Abrams. However, Bryan Fuller, another Discovery Executive Producer, was a writer for DS9 and Voyager. The third Executive Producer, Rod Roddenberry, was once quoted as saying that Abrams "made Star Trek cool again." I assume Roddenberry would like his next Star Trek to also be "cool." However, Abrams remarked in a 2013 interview that CBS had indicated they weren't interested in an Abrams Trek series. His films have after all been the most expensive Star Trek films to date, and they've heavily relied on those exorbitant production budgets. It's possible that the new series will be in the canon universe rather than the Abrams universe for that reason alone, because it's a very good reason.
In short, I can reveal to you absolutely nothing you haven't already heard about the new series.