This is step 2 for SPEC-720:

at first boot, add information related to "deep" hardware detection, like detecting hardware features that can't be specified as machne-specific. Scriptlets mode envisioned here = add a way to specify a script fragment at build time that would land in the right folder to be launched at first boot. This is very close to the first boot mechanism to install widgets, propbably occuring earlier in the boot workflow.