Renderings, yes, but ones found on Dell's own site! They also look a lot like the recently released XPS 13, so I'm saying that's about what they will look like (more than fine with me!). I will also miss USB A (mainly for thumb drives) but that ship has already sailed with any MacBook, so I'm pretty accepting at this point. I can pick up a couple of dual USB A USB C drives and just go with it. For the rare occasions I connect to a display, I use mini display to HDMI, I can get a TB3 to HDMI cable easily enough, so that's fine. SD is still there, so that's a benefit over the Mac as well.
Wireless mouse and keyboards still use usb-a. As do 99% of external devices. Apple went all in on usb-c port 4 years ago, and still, nothing has changed. Large majority of people still use usb-a, hdmi, display port, etc.
I have a lot of usb-c stuff as well. But when I'm out, and if I forget my usb-c to hdmi cable, I can't connect my laptop to external monitors or projectors.
I'm not so accepting of usb-c only. But we will wait and see what dell finally releases, even tough I think that you are right. It's probably gonna be usb-c only device (+sd card slot).