Honestly this sounds quite positive. They seem to be preparing a bigger package to bring and Stella says that they have to trust the process and that the "domination" in Singapore will not change their plans. So I think we are getting a decent package in Austin. I'm quoting the article below.
Asked about the dilemma the team now faced on whether to go for upgrades now or not, Stella said: “In fairness, that was one of my thoughts after the race.
“We do have some stuff in the pipeline, and obviously, when you have this kind of performance on track, you always may approach things from a cautious point of view in terms of development.
“But at the same time, we need to trust the process. We need to trust the way we've been working so far.
“I've said already that we have taken our time to make sure that once we deliver track side, we have done the due diligence. So, I don't think this will change our plans.”
Stella thinks that, despite McLaren’s advantage, it will not take much for its rivals to leap ahead if they bring upgrades that work.
“In Formula 1, I'm not sure you can back off too much, because backing off means that the others may catch up,” he said.
“And we don't know what the plans of the others are. Red Bull, we see that in a track in which they thought they would not have been very competitive ultimately, they were potentially second best.
“And I think we haven't seen Ferrari [at its best], as even in P1, P2, they seemed to be as fast as us.
“So, I think this race may have been a bit flattering. The situation from a competitiveness point of view, I would say we need to keep being aggressive in terms of development.”
McLaren chief designer Rob Marshall says that the team’s plan was to make sure that any upgrade it did bring helped produce a big step.
“It's about chasing downforce all the time,” he said. “We kind of like to gather the chunks up and deliver it in a big hit.
“So far we've just been focusing on basically gathering those bits up. At some point hopefully we'll have another upgrade to deliver.
“In a way it's nice to be delivering lots of little upgrades all the time, a bit like our beam wing here this weekend
“But equally sometimes you just have to hold on a little bit while you wait for a chunk of bits to come all at the same time.
“The advantage in doing that is that often bits don't combine very well, or as well as you think they would. And if you deliver them in one lump, then that sort of combination of parts has been in CFD together, it was developed together, it's been through the wind tunnel together, so you can be more confident that combination of bits works well together.
“Whereas if you do it bit by bit, you might introduce an upgrade on one part and then work on another part and find out actually it's a bit compromised by the previous change you made.”