So it looks like Lethal Weapon 5 may soon be in production. Little bits of news and rumour here and here.
Oh and it looks like the rumours of a Blade Runner 2 weren’t quite as accurate as feared. Which is good, because I truly can’t imagine a follow-up movie being any good. I guess if they did an Alien -> Aliens kind of thing where the second one was set in the same world but had a totally different slant it might be worthwhile.