The preview to 3.0/Q after the end titles of 2.0 explicitly announces that Kaworu will descend down to Central Dogma in Unit-06, and we see Unit-06 slowly floating down the shaft. Based on this evidence, I conclude that it is a FACT that the descent will take place.
That doesn't mean he's going down to the Big White Giant Misato called Lilith.
Are you saying that this scene is not relevant to the plot, and that the trailer is just "Hideaki Anno trolling his audience again"? I find that highly unlikely for at least two reasons.
In all fairness, shit that was in the 2.0 preview ended up not being in the actual movie whatsoever.
First, Kaworu has such a powerful presence in the Evangelion universe, that it would just about negate his character concept to have him perform any (and I mean ANY) uninteresting, straightforward and/or anticlimactic actions. Although I do expect 3.0/Q to give him more screentime than he had in NGE and EoE combined, (which may likely present him as a more human character than in NGE), Kaworu is still the prophet who is aware of all the metaphysics in the Rebuild universe, and will not act on a whim. Therefore, whatever is down there (and we know it's a white giant) must be important to him.
Just because Kaworu is going to do something important doesn't mean he's going to be diddling with Lilith. His motives are clearly different in this universe.
Besides, if the white giant (Misato: "It's Lilith.") was unimportant, why not leave it out entirely? Rebuild is partly meant as a more accessible version of Neon Genesis Evangelion, and a sure sign of bad writing is to complicate a story with elements that have no importance to it. Rebuild of Evangelion is not badly written (no, not even where it concerns Asuka Shikinami).
Dude, knock off the bullshit, I never said Lilith wasn't going to be important, I was saying it's not necessary that they're gonna jerk around the name like they did in the first series. Because it's a more accessible, and condensed plot, they might've just said "This is Lilith" so they don't have to explain it later and undo an Adam lie.
God knows there's going to be way too much shit they have to reveal, twist, and explain as it is.
Secondly, whenever a pilot gets into an EVA Unit, the audience may expect a battle. On that note, the scene from the trailer is clearly meant to evoke a parallel with the climax of Episode 24, where Kaworu also descends down the shaft (only with Unit-02, which he pilots from the outside). Although the brief shot does not depict Shinji, Eva-01, Rei or anyone else for that matter, I do expect some sort of confrontation and likely a battle. Whatever it is, it must be at least as climactic as the original Tabris fight.
Irrelevant. Lilith is not the sole motive Kaworu has to battle with anyone.