An important question to ask is what kind of binding will you be using?
Dedicated touring boots will use a toe and heel shape that is officially not compatible with the Alpine Norm and will therefore require a binding that can accommodate the geometry difference. This different toe and heel shape offers easier walking and more traction but at the sacrifice of an "as safe-as-alpine" release.
If you are using a strictly Alpine Norm binding (non-adjustable toe height), then you have to look for boots that are Alpine Norm (or at least have swappable norm soles). If your binding has an adjustable toe height, then it can accommodate Touring Norm boot soles but they might not release properly and some shops might refuse to mount them.
And obviously, if you plan on using a Dynafit-style binding you will need a boot that has tech inserts in the toe and heel.