They are not deprecated yet, but it has been 'planned' for a long time. It's one of those things where not deprecating them doesn't hurt anyone, soit isn't high priority.
Must say that, whatever the behind-the-scenes of the implementation, it seems a shame to lose the nice z = x + y*i notation.
OTOH I guess that could lead to ambiguous code, e.g.
int i = 4;
complex z = x + y*i; // what does i mean here?
