We'd be lying if we said we saw this one coming. In an attempt to market Fallout: New Vegas to a skeptical Japanese public, Bethesda decided to give Fallout 3 the time travel treatment, resulting in a project that – somewhat ironically – looks older than its target audience. As explained by Bethesda:
“What would Fallout look like if it had been made in 1987 by a Japanese development studio? Our scientists have answered that question, taking over the Japanese Fallout website with an 8-bit version of the Capital Wasteland.”
It's worth noting, however, that the demake's only available in Japanese, so you'll have to wing your way through the Wasteland for now. Or, if this really is just like old times, you could always wait for a horribly translated and borderline racist localization to come along three years from now.