Support for more boards on the Web editor.

septillion:
But why not use the offline IDE? Why does everything needs to be online / cloud based?

Working in the cloud has many advantages, especially for a hobbyist!

Working with electronics only randomly, it eliminates the task of keeping track of your files, it eliminates hours of connecting to a com port,... (sometimes)
You don`t need your laptop to do some work, for me Arduino Create is just great.