In a statement shared with Eurogamer, Daedalic says you will still hear some Elvish (Sindarin) language without the DLC "from time to time" - though this paid DLC does fills out the game's world ...

That's not all, though, as pre-ordering the Precious Edition will give you access to a Sindarin voiceover expansion, narrated by professionals. Of course, it's only the elves who will speak this ...