Wow, i haven't seen new storyteller stuff from them in Years.
I know, I figured the whole project was dead, but no, they were just quietly working on it the whole time.
i didn't know the mod team got this far ahead .
It's hard to judge "how far" they are based on trailers, for all we know that's literally everything they've got done put together and the rest of the game (IE, the overwhelming majority of if) is barely started. It's be nice if they gave more concrete figures, which they should be able to do since we know what the end goal is, they oit to be able to say "we've got 50% of the equipment models, 40% of the world space, 25% of the quests remade" etc.
As for the trailer, I see they're bringing the Wattz laser rifle mod in, alongside the AER9. Interesting choice, and a good sign the team is willing to make changes if they're needed (though why they decided to add the wattzs instead of ditching visable holstered weapons is a question worth asking). I have more questions about showing off the LAER, however, that's not a base game weapon and unless they're just integrating the existing mod (I guess that trend I don't like of people recreating distinctive weapons from prior games in New games does have its upsides), they should maybe be more focus on just remaking NV as is and not doing DLC stuff.
As it happens, the Fallout 3 remake team is doing the reverse, last I heard they're trying to remake Point Lookout first as a testbed/showpiece before they do the main game.