It is still open whom Augustus Prew, Simon Merrells, Geoff Morrell, Alex Tarrant, Trystan Gravelle, Lloyd Owen, Will Fletcher, Peter Tait, Peter Mullan, Kip Chapman, Leon Wadham, Fabian Maccallum, Anthony Crum or Dylan Smith will play -of all the actors confirmed by IMDB!
Gravelle has been rumored for Pharazon, Tarrant for Valandil, Lloyd Owen for Elendil, Will Fletcher as Finrod (but in 8 episodes??) , Tait and Mullan as Durin or Palantir, Dylan Smith as Largo Brandyfoot.. Prew, Merrels, Morrell, Wadham, Maccallum, Crum, Chapman all open with a ?
Kip Chapman already has been seen in a scene with Galadriel and dressed as an elf so he so far is my best guess as Celeborn.Though... i don't know... maybe he's Amroth
Trevyn has also been rumored as an Elf.