From the French Starcraft twitter

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Q u o t e:
The capacity improved of harvest of resource of Protoss is from now on accessible since Nexus.

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:D

Hmm.. sorry, the French translation is a bit misleading. Just consider it translated as "the Protoss macro mechanics" and don't read too much into it. ;)

Ok, further clarification. It is not necessarily directly and only linked to ressource gathering. More soon! :P