Thanks for letting us know this is only Part 1.
That is miserable when they do that....I will wait until after Part 2 is out—and then watch both.
Not sure how many parts there will be. I guess they could finish it off in two parts, but one never knows.
Might be a long wait, too.

I hate that trend of ‘movies — to be continued’.
It is bad enough to watch a 6-12 episode streaming series, cliffhanger, wait wait wait — when is the next season? Some go two to three years before the next season shows up.
I started season 2 of Another Life on Netflix. I completely forgot what season 1 was about, even after watching the recap and trailers.
TV/Streaming are infamous for their cancellations of cliffhanger series.
I vaguely recall Dune. I read the book (first volume) decades ago and remember seeing a movie later. IIRC, the movie was long, dull and difficult to follow — sort of like the book.