7. The Events Of The First Film Will Be Significantly Downplayed
The problem with a film that has completely insane narrative that also takes its dramatic stakes seriously, is that it can be very difficult to follow through with the threat of those stakes. Despite Matthew Vaughn claiming to have various ideas for a Kingsman sequel as far back as before the release of the first, the ending of Kingsman still means that a huge amount of stuff will need to be glossed over in a follow-up.
Why? Well, the close of the first film has horrific and unprecedented ramifications on humanity. Valentine broadcasts a neurological wave that causes the human race to essentially kill itself. Parents are brainwashed into killing their children and everyone becomes a murderous psychopath bar those with a protective brain chip.
The time between when this wave is broadcast and Eggsy manages to stop it is rather large, somewhere in the region of five to ten minutes. In that time, it's undoubted that millions upon millions of people died, with just as many killing their children or mortally wounding them. The sequel will pick up where this left off, significantly downplaying these numbers and the societal ramifications, purely because nobody really thought they'd have to deal with it.