From the IRC chat with David Peterson we got a little more info on dothraki pronounciation. (Transcript slightly edited to group things by context.)
<ingsve> double ee's are pronounced like the spanish creer is that correct?
<ingsve> as in khal-e-esi?
<DavidJPeterson> Yep.
<DavidJPeterson> It'll probably be pronounced differently at certain times by some in the series in various contexts. Nothing to be done about that.
<ingsve> is there any instances where letters are pronounced diffrently than in the phonology? or are all letters pronounced the same no matter where in a word they come?
<DavidJPeterson> I tried to make the romanization phonetic so as to avoid the need for that.
<DavidJPeterson> However, there are instances.
<DavidJPeterson> Should be slight.
<DavidJPeterson> Or happen naturally.
<DavidJPeterson> For example, vowels preceded by [q] are pronounced differently.
<ingsve> as diffrent vowel sounds than the 4 we know about?
<DavidJPeterson> Phonetic sounds, yes. The 4 vowel phonemes really float around.
<DavidJPeterson> /i/ > [e]; /e/ > [E]; /o/ >
- ; /a/ > [A] / q_ (if you know ling rules).
<DavidJPeterson> the sound with the least variability is probably /i/.
<DavidJPeterson> Both /o/ and /a/ travel around quite a bit in their respective areas (low for /a/; back [-low] for /o/).
<ingsve> you seem to like the kh phoneme
<ingsve> is that always pronouced
<DavidJPeterson> Kh will float around.
<DavidJPeterson> Probably more palatal before front vowels.
<DavidJPeterson> The velar fricative will vary from a velar to a palatal fricative (always voiced).
<DavidJPeterson> Depending on the vowels.
<DavidJPeterson> Something like the ach-laut/ich-laut thing in German.
<DavidJPeterson> But both progressive and regressive.