Here's a handful of screens showing some of the new features in action:
Note the bookmark control beneath each image, below-right - tap this to 'save' it to a private area on your account on Instagram.
Within the camera interface, there's a Boomerang mode, where you shoot a few seconds of video and it gets looped backwards and forwards for comic effect - plus a 'hands-free' mode, a.k.a. err.... start and stop recording, rather than having to hold the control down, the normal way Instagram's video cam works.... I know, I know...
You can grab or update Instagram UWP for Windows 10 (Mobile) here in the Store.