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So can we assume that D2 will be postgres/mysql ?

It sounds like you're making a simile but I don't understand it. The article did literally state D1 is based on sqlite.

The opening paragraph reads "Today, we're excited to announce D1, our first SQL database." read: first

and well R2 and D2 would make for a great naming scheme.

Ah sorry I missed you saying d2 not D1.