Wheeeeee! Another Age of Mythology fan here

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The Pharaoh was naturally the first thing I thought of when I heard this news

. Even though the Pharaoh is a definite bonus when utilised as effectively as possible, it's still hard to nail down 'Empower lists', like you would with build orders.
In general, I find that the very nature of the Age RTS series leads to less emphasis on build orders (although they're still very important).
This Nexus mechanic sounds similar in that it will be able to suit the playstyles of different players and that you'll still be able to get quite a bit out of it even without adhering to a strict pattern of usage. At least, that's what I feel :].
Protoss also have a minor Egyptian vibe going on, too, which I think makes this mechanic rather cute, if it sticks :P.