Nobody can tell for certain, obviously, but it may be very irrelevant, as much as the original referendum was, or as any future referendum or such may be.
What is relevant first and foremost is that following Miller vs. Secretary of State, the Parliament passed an act, and with that the "constitutional proceedings" as per Art. 50 were met. What's relevant, too, is that Art. 50 was then invoked. So that's done and it is binding, and the clock has been ticking since.
What matters now is that on October 31, the extension-extension ends, and if no other extension has been granted and if Johnson has not revoked Brexit until then, it means that UK is out, no deal, end of story.
That is what currently matters. Everything else is just talk.
While the EU parliament has stated that they are favourable towards an extension (if there is a good reason, and if... blah blah) they don't even have a say in it, so that statement is rather worthless. Even if Johnson asks for another extension (which I think he cannot afford politically), it is not sure that it will be granted. Among those who do have a say in the matter, there have been several who, unless they do a 180° U-turn, are opposed to it, and it needs to be an unanimous vote. So, who knows, it's nowhere near certain.
As for withdrawal, Johnson can only revoke "in accordance with constitutional requirements blah blah", so another act would be necessary. Slightly under two weeks time for that, might be a bit tight, but generally possible as a desperate last-minute move. Except...
The question is, will Johnson do it? He might as well show everybody the middle finger, and what are you going to do about it? There's not much you can do. Oh yes, the parliament passed a bill. A nice little bill, voted on democratically, and written nicely on a worthless piece of paper. The rule of law, right.
Criminal proceedings against the Queen as well as Her Majesty's Government are prohibited. Which, if I understand correctly, means as much as: That bill is worth about as much as a piece of toilet paper, and Boris Johnson might as well use it for that purpose. Not sure if he is protected from being prosecuted for doing that, too, but I guess he is.
As a fun fact (again, if I understand correctly), the UK parliament on the other hand side does not seem to have immunity at all in the UK (only as far as civil action goes, and only for libel/slander) as they do in other countries. So they can be criminally prosecuted, which is kinda funny.
Be that as it may, Boris Johnson is a part of Her Majesty's Government. So... there is a law, and if Johnson just feels like he cannot be bothered to follow that law... well. So what. What are you going to do about it?
He is required to let the Queen sign stuff. Let's say he doesn't. He is required to find an agreement with the EU or failing to do so ask for an extension. He is required to provide status updates. If the parliament passes a "let's withdraw last minute" act, he is required to hand in the note.
Let's say he doesn't get an agreement, and doesn't ask for (or get) an extension. Let's say he lies about it in his status reports. Let's say the parliament decides "withdraw" the last moment, and he simply doesn't hand in the papers. My dog ate my homework, my car broke down, or anything excuse you like. He might even outright tell everybody: Yeah, I didn't feel like it. I told you, deal or no deal, we're out!
What now? Well, sue him. Jail him. Oh wait, you can't. What are you going to do? Have him resign. Oh teh noes, what a harsh penalty. Also, even if you could sue him, what would it change? Deadline past is deadline past. It simply doesn't matter whom you blame, whom you sue, or how you complain about it, once you've established facts.
The situation that a single man can just do what he wants and the state can't do anything is not as kafkaesque as it may seem (well it is, but it's nevertheless real). Rule of law? That's an illusion.
Remember Helmut Kohl, who back in the old days (around 1980-90?) replied to a court order which compelled him to reveal information about some huge sum of black money that had been found simply with "Ha ha ha, I'll not tell you anything". And that was just the end of the story. How many days did he spend in prison? Zero. Did he resign? No. Did it hurt his political career? No. Did it hurt the career of his protégé? No.
Guess what Boris Johnson will say when, after failing to comply with the bill, he is challenged with: "But you were required to...".