If you compare it to the current relic quest, the most obvious headstart would be skipping the initial busywork of forging your baseline relic and just using your Zeta instead.
They've already said that i130 gear will be good to level 55-ish, so the initial ilvl of the new relic at 60 would probably not be too far off what the current Zeta relics end up at now. It's not like they're ever going to let people skip huge amounts of what's presumably going to be a very long grind, and if the new relic starts at say 140 in its unfinished state, it's going to make a Zeta look like a big pile of garbage anyway.
