I heard that as well but if you look at the pic
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you can see two giant trees of light which occur in only one place in Tolkien lore.
I thought maybe Mallorn trees and it was just the sun behind them, but they don't grow in Eregion and that second tree looks to be made of almost pure light.
So maybe they have more rights than we thought, or they are adding in things that to the lore of the 2nd age for the show
Which is pretty much my fear for the series.
Since they don't have enough material from the appendices we end up with a bunch of corporate scriptwriters fresh outta the latest summer blockbusters trying to match the works of Tolkien, and end up creating new characters and story arcs that detract from the original work.
Call me a cynic, but I find it hard to believe there are any writers in Hollywood that could hope to hold a candle to Tolkien's literary skill while meeting a 8 week deadline or whatever the production schedule is.
Kind like what they did to the Hobbit but even worse because there is even less material in the appendices to make a series on than the Hobbit.