Just to note... they talked about wanting to replicate the feeling of the holy avenger / holy slayer archetype, not that the sub-class will exactly match the 4E Avenger. So this new build does not guarantee it will be an armor-less paladin. If I had to guess, it'll still be a plate-wearing class, just that it's focus is more towards punishing the wicked, rather than defending the decent.
Ah, okay; but as a tangent, a Monk can take that shield feat or multiclass and Captain America his own heiny?
Though, technically Cap does wear light chainmail.