Scratch 3.0 has a cool new #micro:bit extension.
Check out the projects in this studio if you are interested in the new possibilities. I hope these projects inspire you to make your own micro:bit Scratch projects.
If you're going to use the micro:bit together with Scratch for the first time, check out the turorial @CodeCasey made on how to install Scratch Link and make your micro:bit ready to use it with Scratch 3.0:
Btw, you need Bluetooth 4 to connect the micro:bit to Scratch 3.0. So unfortunately it doesn't work on every laptop or desktop.
To connect a micro:bit, please click on the orange exclamation mark that appears when you have selected the micro:bit blocks (see inside).
If you don't have Scratch Link yet, then a note appears on how to install it. You also need to download a .hex file made by the Scratch Team on your micro:bit.