I hope Ridley will direct the next one, if they are going to continue/finish David's story. But only if they do nothing stupid like ruin the mystery around original space jockey (what's left of it), the egg cargo and connect it to Alien in any way. He should steer further away from the original films (no queen, no pulse rifles...), so that the prequels could become it's own series. We don't need lame contraticting prequel stories that f**k up the established lore and are not even near to the standard of the classics, do it right or don't do it at all.
Or they should simply reboot this mess.