Some snippets from the currently draft
FAQ:
(1)
Q: Do rules applying to ‘the unit’, such as those from Formation command benefits (e.g. the Skyhammer Annihilation Force), or unit-wide special rules such as Dunestrider from Codex: Skitarii apply to any attached Independent Characters?
A: No.
Rulebook FAQ, Detachments and FormationsQ: The Skyhammer Annihilation Force. Can Independent Characters join this Formation? If so, do they gain the special abilites bestowed upon the Formation?
A: Independent Characters can join this Formation in the usual way, but they will not gain the special abilites bestowed upon the Formation. This means that if the Independent Character joins an Assault Squad from this Formation, for example, that squad won't be able to use the First the Fire, Then the Blade special rule to charge the turn they arrive.
Codex Space Marines FAQ, page 9
So from this the attached Librarian doesn't get to move, nor embark. Unless countered in a different
FAQ, or unless I've missed something, the rest of the unit should still be able to use the rule to move
D6", but will not be able to embark (as the entire unit cannot embark).
(2)
Q: Do Wave Serpents taken as Dedicated Transports get +1 Ballistic Skill for being part of the Aspect Host or Dire Avenger Shrine Formations?
A: Yes.
Codex Craftworld Eldar, page 1
This bit is from the Eldar
FAQ, and concerns a bonus that is applied to "all units in this Formation", where
DT's are not listed as part of Formation but are purchasable by the units that are listed - the
FAQ reply proves that the
DT's become part of the Formation, and benefit from it's rules.
Also - there
are vehicles that can transport other vehicles.