Now that AZ 24 extends to Ironwood Rd. (even though it is a service road connection), are there any updates on when it will connect with the future Pinal North–South Freeway? Or is construction of that freeway a very long way off?
By the looks of the photo in the ADOT link, they did not build complete interchanges at N-S cross roads. Rather ended the mainlanes at either side, and funneled traffic up ramps at each N-S future interchange. At least the thing has a decent median, if they ever needed to widen the thing.
They built the interchange ramps to the connecting roads, but not the overpasses. The overpasses will be added later, making AZ 24 a full freeway. This is common in metro Phoenix. They still exist on the 303 west of I-17, although this will be upgraded to a full freeway starting next year, IIRC. However, none of the streets that will connect to it (35th, 43rd, and 67th Aves) have been extended that far north yet.
AZ 51 started out this way, too, back in the '80s.