There are lot of questions about how the rest of the series will play out, including if and how Celeborn will be introduce, who will become the Nazgűl, etc. But to me one stands heads and shoulders above the rest. That is how they will present the Downfall of Númenor, and how it comes about. This is, arguably, the single most important part of the history of the Second Age, and one that they seem unprepared to portray. The Downfall occurs when the Valar "laid down their government of Arda" and "Ilúvatar showed forth his power" and "changed the fashion of the world." Or, more properly, since the LOTR appendices are what they have rights to, "the Valar laid down their Guardianship and called upon the One, and the world was changed. Númenor was thrown down and swallowed in the Sea, and the Undying Lands were removed forever from the circles of the world." But while the Valar have been mentioned several times in the show (most prominently in the IMO ridiculous sequence in which Míriel faces the sea creature and is 'judged' to be innocent, I don't think they have mentioned anything about Eru Ilúvatar or the One. Will they incorporate that into the narrative, or will they try to lay the drowning of Númenor at the feet of the Valar? Based on what they have done so far (good as some things have been), I'm not confident that they can pull this off. But if they don't, the show will be a failure.

IMHO, of course.