Probably just new colors for 2019. I can see it getting some minor tweaks but I doubt it'll get anything major.
I don't see the point of a slipper clutch on a bike that can do over 100 km/h in 1st gear, at least not off the track. I mean if you're dumb enough to shift into 1st at 150, then you pretty much deserve to wipe out.
I like the GSXS's current role as a simple no-frills sport bike. That's why I bought it instead of the S1000R or the Tuono. Those features like a quick shifter and what not are really only needed on the track, and if you race on the track why wouldn't you just buy a GSXR? If ergonomics is an issue, you can add riser bars to the gixxer.