Stunning kitchen reveals are set to be overshadowed by one team's big mistake

It's finally time for the most magnificent Block Room Reveals of the year, kitchens.

We've heard it time and time again that the kitchen is the heart of the home. The newest promo for The Block hints that things are going to be spectacular, although one team will make a big mistake.

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"Oh my goodness," Shaynna Blaze exclaims as the judges arrive in one kitchen.

"Sunday, the most stunning reveals of the year are here," teases the voice-over.

So far the teams all have grand plans for their spaces and it looks like some of them will pull it off.

"I am home," Neale Whittaker declares in one space, while Darren Palmer says, "I am dead." (In a good way, we presume.)

The voice-over hints that the 2021 kitchens will be the most beautiful you will ever see.

Shaynna, Darren and Neale are throwing around words like "wow", "impeccable" and "insane" as they make their way through Bronte Court.

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"Look at this architecture," Darren marvels as he looks around one space.

Something really impresses Shaynna, who shouts, "Yes! I have to have it right now."

While they might be luxurious masterpieces, there is a big 'but', and it looks like Mitch and Mark are in the firing line.

"I was waiting for the 'but'," Mitch says at HQ.

The voice-over hints that one gigantic mistake will unleash kitchen chaos.

"That's dumb," Darren says.

Shaynna adds, "That's insane," and it doesn't sound like the good kind of 'insane'.

"That is really dumb," Neale continues.

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What is the mistake? It's not clear but Darren really isn't a fan of whatever has happened in one kitchen, to the point that he says, "It makes me want to vomit."

Something triggers a walk-off from Mitch and Mark, who seem to leave before Scott has finished judging at HQ.

"They're gone already?" Scott quips as the grandads walk out.

Mitch and Mark give a wave as they head out of judging, clearly unhappy about something that has gone on while Scotty read out the judges' feedback.

"I'm supposed to listen to them, yeah, (bleep)," Mitch fumes at the cameras.

The Block airs Sunday at 7.00pm and Monday to Wednesday at 7.30pm on Nine. Catch up on all the latest episodes on 9Now.