This release will have less obvious changes than a normal one. It's a major upgrade, but less to do with obvious UI things / new features. For example, perhaps ACIS fixed a bug 2 years ago that affects how a 3D fillet might operate for specific geometry. In AD2017, perhaps the fillet would fail, and in the new release, perhaps it wouldn't because we're using the upgraded ACIS. That's just an example to illustrate the kinds of benefits this release is primarily about. There are some notable exceptions that you will notice, but the meat of the release is geared towards modernizing the components, onto which we can build cool stuff down the line.