There are no good elements for D; Dysprosium is the only one, and it's a mouthful. There are no good elements for E; Europium is the only one and would seem political. Is Fluorine their next release? (And then Gallium or Gadolinium?)

After Carbon, they should just update to Gemini 4.1 or 4.5 or whatever, and drop the random unrelated elements.