It does have IR tracking, so presumably it could be made compatible with lighthouses, but if they don't make it compatible (and currently the page makes no mention of it) I don't know how well it could track objects out of frame considering the cameras are still mounted on the headset.

The controllers also have gyros, but from what I've read dead reckoning from gyros small enough for mobile devices really isn't reliable for extended periods.

The controllers won't have lighthouse tracking though. The IR tracking is the headset tracking the controller's IR LEDs, which the Index controllers do not have. It might be possible to have the headset IR track the lighthouses, and then use the old Index controllers, which also track the lighthouses.

There's also tools to calibrate the different tracking methods together, but that seems less than ideal.