Jakt was described more as an experiment and to potentially replace C++ in the codebase, rather than definitely. I haven't seen any official word on this but as

Jakt was described more as an experiment and to potentially replace C++ in the codebase, rather than definitely. I haven't seen any official word on this but as you imply I would assume that this effort is essentially dead now. Just as with the operating system itself, the focus eventually shifted elsewhere and Jakt was left behind.