Please, God, no. Fanboys have made Boba Fett into the most tiresome character in the entire franchise, and having him escape the Sarlaac would be nothing but lame fanservice. I'd rather have Lobot as the villain.

'Cept Fett is considered more of an iconic OT character... and (assuming he aged normally) Boba would be about 65 in the timeline had he survived the sarlacc pit. Apart from being the wrong nationality, Sydow is too old... but if his face is obstructed by cybernetic parts, it would be a moot point. Still, I highly doubt he's playing an established character.

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Serkis as a Sith alien and is the big bad.

Anakin Skywalker.

Evidence:

He's a prequel character.

Sith connection.

His identity will shock the audience. Is some second-tier character going to shock anyone?

He's living on Tattooine, his old home. Why would the movie go back to Tattooine again? The Skywalker family is the only connection to that world.

He's a cyborg.

He's watching over his granddaughter.

Max von Sydow is in his eighties, the same age Anakin would be at this point in the timeline.

There's a Darth Vader flashback that takes place on Endor. In this flashback we will learn that Darth Vader/Anakin Skywalker survived. If they're going to do a flashback with Vader, it must be for something huge. This is Luke's stunning reveal.

It might even explain why Anakin's 'force ghost' in the last ROTJ revision was that of his younger, pre-Sith self. Luke never actually interacted with the ghosts at the end, so they might have just been a vision of some kind. Also keep in mind that we never saw Anakin/Vader fade away to become a force ghost, and he was never taught how to become one, either. This also mitigates a sucky change made to ROTJ if those weren't actual force ghosts Luke was looking at.

we never actually directly saw Anakin die. He just said that if his helmet was removed, then he would die and he was already dying so it didn't matter. Well what if someone came along and saved him after Luke left? Some Imperial officer could have found him, put his helmet back on, got him off the Death Star just in time, and then got him to a medbay somewhere.

If Anakin could survive that extreme burning on Mustafar, then he could survive some Force Lightning temporarily shorting him out.

If you never see a character directly die on-screen, then there's always a way to bring them back...

Luke carrying or dragging Darth Vader's body into the escape ship? I can't recall now. Regardless, the idea that Luke would take the time to strip down his dad while the Death Star is crumbling around them, just to get his armor and helmet so as to burn it and it alone on the surface of Endor is ridiculous. Revisionist history aside, it was clearly meant to be Luke burning the body of his dead father, confirmed by the force ghost (regardless if it was old or young Anakin) shown afterward

in that, at the time, it was speculated that there should have been no body left to burn because we saw Obi-Wan and Yoda disappear when they died, so Luke burning an empty suit has been something that has been speculated for a long time. The prequels sort of muddied this by not really explaining the force ghost concept. There is a lot of wriggle room there. According to the prequels, Kenobi and Yoda should be the only Jedi who could force ghost.

A Force ghost pretty much dooms the idea it's Anakin... but it'd be a great surprise if it was him

According to the prequels, Qui-Gon was the first Jedi to learn how to become a Force Ghost. Qui-Gon didn't disappear either though. Qui-Gon then taught it to Yoda, who in turn taught it to Obi-Wan. How Anakin ever learned it is never explained.

At the very end of ROTS, Yoda said he has been talking to an "old friend" and Obi-Wan is surprised that it is Qui-Gon. Yoda then says he will teach Obi-Wan.

There was also a storyarc on the CGI Clone Wars animated series that went into a little more depth on the Force Ghost thing. I never saw it though because it was the Netflix-exclusive final season, and I don't subscribe to Netflix.

Unless as someone else suggested, that wasn't actually a Force Ghost. How did Anakin ever learn it? According to the prequels, only Qui-Gon, Yoda, and Obi-Wan ever learned it.

How did Han and Leia's daughter end up on Tatooine? Did they seriously leave her with Anakin? Or was it just a coincidence? What would be the point of keeping Anakin alive all those years?