After a long-awaited SHI came out, Google finally released the official version of Android Studio 3.0 on October 25. Here is the official address of the new version (may need to overturn the wall). The official list of new features is very clear.
Here is just a brief summary:
1) Support Kotlin programming language
2) Support new features of Java8
3) Brand new layout editor
4) Adaptive Icon Creation Wizard
5) XML fonts and downloadable fonts
6) Support Android Things
7) InteliJ platform update
8) There are also build and Debug updates.
The following is the official video of the update feature. If it is inconvenient for some people to go over the wall, I have moved to Youku, the link is here