The update will undo the horrendous changes that Snapchat made last year that had Stories appearing willy nilly as they will now show up in reverse chronological order.
The only downside is that removing an algorithmic feed will mean that people who post frequently will appear higher in your feed whereas your besties will only pop up at the time that they post.
Still, at least you'll be able to keep track of what's going on in your pal's lives as. they. freaking. happen!
The update is slowly being rolled out on devices across the globe so be patient and all will be at peace in the land of the Snap in no time!