Scratch 3 is the latest version of Scratch which is due for release just before the new September 2018 school term.
Scratch 3 is currently in beta version with a partially working Scratch 3 preview.
At the time of writing (April 2018) there’s quite a lot of disabled features in the Scratch 3 preview, (not ready for school use) essentially it’s a significantly improved version of Scratch 2. Scratch 2 is great, but it has it’s limitations.
Although Scratch 3 isn’t ready for school use, the current Scratch 2 program is and moving from Scratch 2 to Scratch 3 later this year should be painless: still the same basic premise of dragging blocks around.
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