I just read it, and other than a slightly slow pace it was pretty decent. I'd call it more of an interquel (if there is such a word?) than a prequel though as it starts with Taylor and the crew landing (with panels straight from the original Marvel comic adaptation) and the thrust of the story takes place after that but before Taylor is captured and brought to Ape City. With that kind of a short time line(it was never clear how long they wandered in the Forbidden Zone, a few days...a week at most?)  I suspect the pacing will have to pick up.

edit to add: I misread the opening, there is a little note at the top of the panels from the old Marvel Apes book that says "soon" so it could be any time before Taylor landed I suppose. A strange way to start the book, I think it would have been more straightforward if that was just the immediate lead in. 

The comic itself definitely went off into unexplored territory that was separate from the films but from memory, and from the panels reprinted here in color(for the first time?) as far as the film adaptation piece went it was pretty darn accurate. Even most of the dialogue was boosted directly from the film.
As for this comic? It's hard to say if you'll need knowledge of the original Marvel run. I could be wrong but the antagonists (who seem to be separate from the mutants though apparently occupying the same land in New York City albeit above land rather than beneath) are completely new. I'm betting if any references to the original Marvel stories are made they'll be more flash back panels like we saw here than real deep cuts.

That is correct.

Adventures on the Planet of the Apes was published from 1975-1976, alongside the black and white Curtis magazine that it was reprinting. Whereas the magazine was aimed at the hardcore fanbase, Adventures was a standard color comic book aimed at children who also loved the franchise. I've honestly never picked one up, so I'm not sure how the coloring looks.

Just read the review of the second issue of the new series and (spoiler?) the infamous Alpha-Omega bomb appears.

Stupid question: why it was shaped like a missile? I mean, it was irrelevant where it would explode, right?

Correct, but you're welcome to take it in new directions.

You have a point. I doubt that the military would have put an "Alpha" and an "Omega" instead of a thousand acronyms or flags or symbols or serial numbers or whatever. Still, Taylor immediately understands what Brent is talking about when he tells him about the bomb, so...