The talk is presented as though the year is 1973 and Bret Victor is reviewing some of the great stuff that's happened the last decade and four major trends that he can imagine will define computing in 40-someodd years.
They revolve around constraint/goal solving instead of writing procedures, direct manipulation of data instead of coding it, using spatial representation and reasoning rather than huge piles of text, and real concurrency rather than mock concurrency built atop sequential Von Neumann machines, all with great examples (these are what the references largely fill out).
The talk concludes with Bret Victor slightly dropping the gag and making the point that these particular things are not the real point: the real point is that believing we know what we're doing, individually or as a profession, is deadly to our creativity, and that the great ideas discussed all happened then because computers were able to be useful at that time, but no one thought that they'd figured it all out yet.
He urges us to realise and become comfortable with the fact that we don't know what we're doing, so that we can be free to do anything.
