So in the beta it says that the legacy bonus of Rapa Nui is:

MAKEMAKE'S EYE

+1 Industry on Coastal Water

Applies MakeMake's eye for 5 turns to newly created cities.

Does this mean the bonus will ONLY work for 5 turns, and ONLY on new cities? If so, it's extremely weak, even more so since we won't be building so many new cities after the first 2 eras of the game are already over.

Can someone clarify what that last line actually means?

Thanks.

the bonus has 2 parts.

First, it gives +1 industry to all coastal water tiles. This is applied to all coastal waters in your empire all the time.

Second, it applies MakeMake's Eye to all your newly created cities for 5 turns. MakeMake's Eye is an status effect that adds +50 industry * Era to your city.

They're not linked in any way and are two different effects that both apply.

MakeMake's eye seems like a pretty weak bonus at a glance, BUT wait until you research Tree-Masted Ship (early modern)

Now build a settler in any city, detach a territory, and move it to an outpost. Use the settler ability and wuptii you have a city with all the infrastructure you have researched, 210 production already available and 4x50x5 = 1000 production. This can very fast brind a newly created settlement up to a nice blooming city.