there's no "tweaking", the film is in the can they did some minor reshoots in August and its done. No film work on Dune 2 is apparently planned until this is released, so that pretty much is a big "welp... there will probably be no sequel"
hope Dune doesn't end on a cliffhanger. I'd bet we don't even get to to the attack on the Shield Wall or the Imperial Palace, it probably ends with Mua'dib taming a sand worm. No Sting vs Paul naked wrasslin
i guess we should expect another Dune reboot in 20 years, during the water reclamation wars where Stilsuits will be a quaint idea