Barad-Dûr and Mordor are not listed on the map so that could mean this series is set before SA 1600 which is when the One Ring is forged, Barad-Dûr is completed, and Sauron openly declares himself. Imladris isn't on the map but Ost-in-Edhil is, implying it is set prior to the Sack of Eregion and founding of Rivendell in 1697. Lond Daer is on the map, so it can't be set earlier than SA 750-800. Since they're teasing this with the poem about the rings, my guess it is it will start out just prior to or during the forging of the Rings of Power and the One Ring.
The order they released the maps in could also be significant -- most recent map seems to be set furthest in the past. So, I'm also guessing they are planning a series spanning a large span of time using Elves, Sauron and other long-lived characters to link the various seasons together.
I'm cautiously hopeful. With John Howe involved, the look of Middle Earth should be incredible and also consistent with the LOTR and THE HOBBIT trilogies -- my favorite aspect of those movies -- and with Tom Shippey involved there are no excuses to getting the lore wrong. I'm sure they'll have a good cast, and everything will look wonderful, so as usual it all comes down to the writers. Are they going to be able to pull off something that feels like a saga Tolkien wrote beginning in the Second Age, or are they going to morph it into something more GAME OF THRONES-flavored with all of its court intrigue, grittiness, lewdness and so on? If they stick close to Tolkien, my guess is they will use all of his writings they possibly can starting with "Aldarion and Erendis: the Mariner's Wife" and with some Elf characters added in to that tale, like Gil-Galad, Cirdan, Elrond, Celebrimbor and/or Galadriel, and that as we move forward in time the Elves will provide consistency in the way of the cast. Then we'll see a statue of King Aldarion. That might make for a decent prologue -- with viewers seeing it from the point of view of of Numenoreans 'returning' to the Middle Earth -- before moving on to the Forging of the Rings and the War of the Elves and Sauron. Such a prologue would also set up a 'call back' when the Numenoreans show up later to kick Sauron out of Eriador. My prediction is season 1 will conclude with the Forging of the Rings of Power, and a later season will conclude with the Numenoreans showing up to help in the War of the Elves and Sauron, and then maybe another later season ending with the Fall of Numenor and Sauron getting his revenge. So there will some back and forth, and perhaps finally the War of the Last Alliance, with Sauron being cast down and losing the One Ring.
I recently watched the documentary on Amazon Prime titled "Looking for the Hobbit" starring John Howe and featuring Tom Shippey. It is mostly about John Howe searching for the sources Tolkien drew upon when creating the Hobbits and other features of Middle Earth. It is pretty low key, with not much scholarly depth, but I recommend it if you like John Howe's art and want to enjoy some visuals and his travelogue.
Lets just hope it wasn't really: "SPECIAL THANKS TO TOM SHIPPEY FOR VALIDATING THE FOLLOWING: A BIGGER AND TOTALLY UNNECESSARY STORY BREAKING ROLE FOR ARWEN, REPLACING HOBBIT HARDY FRIENDSHIPS WITH CONTEMPORARY URGES, UNCHARACTERISTIC RACIAL JOKES, AND OF COURSE ACROBATIC SURF ELVES."
My biggest fear is that they will introduce a hobbit character into the Second Age storyline and make him (or her!) integral to the defeat of Sauron. Tom Shippey and others with the slightest bit of Tolkien lore should immediately shoot that down, but the idea seems obvious and obviously wrong at the same time.
I'll admit, I would be terrified to be a writer on this show because I know there are millions of fans out there just like me who are -- if not not anxious to rip it apart -- difficult to please with any adaptation whatsoever.
Good news -- I just read that the Tolkien Estate does have veto power for the show, and the First and Third Ages are off-limits: