I know some of these questions have been beaten to death; however, I can't find an updated answers……

Can I use the Picoboard with Scratch 2.0?

Will one be available in the future?

I have heard you can use an old RCX or a NXT and Scratch - is this true?

What tools do you recommend for “connecting to the physical world” - this would be for students in grades 3-8. Finally, do these tools use Scratch 2.0?

Look at this thread on the pico board. A Scratch 2.0 extension is scheduled for the spring.

There is an NXT interface for Snap!, a Scratch like program .

s2a_fm is a hardware extension for Arduino that works for both Snap! and Scratch 2.0.