I am a long time Specialized Roubaix rider currently riding an older model Roubaix. I have been patiently waiting for the 'new model' as it has been a few years since they have release a truly new model. I was really hoping for internal frame storage, integrated cables (I know there is a lot of hate, but I love them), maybe some more modern frame styling.. essentially bringing the Roubaix into the modern trends.
I just saw the new Roubaix SL8 and found it does not have any of these things, and yet it is actually a new frame design....
My question to those who know more than me, should we consider this the 'new model' for the next 3-4 years or is this still just an incremental update? With the new title of SL8 and a new frame design I fear this might be it for a while?

I'd bet the Future Shock feature is a big roadblock to having internal brake hoses and cables.

Future Shock Road Block ftw?

Yea, I was thinking that too, seems like as leaders in innovation Specialized would be able to engineer some clever solutions but they also probably don't see the need on their Endurance line..

Looks pretty good. Three water bottles and a top-tube mount. The Future Shock is lighter and smoother, they say. I wonder what the Pro and S-Works models weigh.

Pro is 8.1kg, S-Works is 7.38kg, both with the 32mm Roval Terra Wheels.

Wow, that S-Works is light! The Pro is not bad either but the S-Works...

This is a major update, so yes you can expect
3-4 years for the next major update.

Fully integrated brake hoses would not be a good idea with the Future Shock, which is why they are still external and probably always will be on the Roubaix unless they drop the Future Shock, which now seems very unlikely.

Internal frame storage would have made the frame slightly heavier. I think they made the right decision adding extra frame mounts instead, given the overall design objectives of this bike ie.lightweight and supremely comfortable endurance/gravel racer.

This bike looks awesome. I spent some time on the SL7 Roubaix in Colorado last summer and really liked it. The ride is very smooth and the bike still feels responsive and quick. I'm assuming the SL8 continues that trend.

The only hesitation I have on this bike is the Future Shock. I found it to be mildly annoying, and with wider/tubeless tires it seems totally unnecessary for road riding. If I'm venturing into rougher terrain, I'm going to just ride a gravel bike. I wouldn't avoid the bike because of this.