I could be wrong, but I think the OP was asking about "CS Theory" meaning the branch of computer science that deals with the theory of computation. Turing Machines, Automata, The Halting Problem, etc. Although those things are all old. I'm not sure what's new, so I can't answer his question.
That isn’t theoretical computer science. In this day and age, that’s firmly in the hands of engineers.
And while AI might be the current big thing, I don’t imagine it will be at the forefront of engineering. I think quantum computing takes the prize there.
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Most bleeding edge stuff is going to be designing the compute pipelines/hardware for ML.
I could be wrong, but I think the OP was asking about "CS Theory" meaning the branch of computer science that deals with the theory of computation. Turing Machines, Automata, The Halting Problem, etc. Although those things are all old. I'm not sure what's new, so I can't answer his question.
That isn’t theoretical computer science. In this day and age, that’s firmly in the hands of engineers.
And while AI might be the current big thing, I don’t imagine it will be at the forefront of engineering. I think quantum computing takes the prize there.
This is really not TCS. I’d say ML foundations count as part of TCS, like VC dimensions, learning theory, and all kinds of complexity.
Programming language pl research in haskell omega has a lot of bleeding edge theoretical cs stuff too