Wizards of the Coast revealed the next Masterpiece Series with the Amonkhet block: Amonkhet Invocations. The theme centers around, well, anything they could add an Egyptian spin to? The community appears split (when is it not anymore?) on the overall design of the cards.
Come take a look at the full spoiler! Or at least the majority, as the Amonkhet Invocations specific to Amonkhet have yet to be released (I'll update accordingly).