Learning the Language
i doubt they will come up with their own language. at most you can expect a cypher (hi new krytan, ascalonian, asuran).
I would guess that you would get gibberish until you get the mastery. Since there are potentially many languages, it is probably not worth it for ANet to actually construct a full language for every race. Also note that it seems the masteries have multiple levels. So perhaps as you rank it up, you will also gain a better cultural understanding (and unlock lore info) of the race, as well as learning the special fighting techniques (or climbing/swimming/etc…) that they use. Here’s to hoping there’s a Quaggan mastery tree!
I’m wondering if I will even care what the npcs are saying, I’ve never paid much attention to dialog, and have had the game sound off since day one. Do NPC’s even say anything relevant to gameplay?