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E1M8B and E1M4B were Romero's first new Doom levels in years - https://mashable.com/2016/01/15/doom-john-romero-new-level

as for the 16GB flash drive - I assume that in a bulk purchase the price difference between that capacity and lesser capacities were negligible. It does appear that they are packing some extras on the flash drive too (though i can't guess as to what - I assume wallpapers and audio)

> Can someone elaborate on the meaning / significance of E1M4B and E1M8B ?

Those were the last two levels created by John Romero, more than 20 years after the original launch of the game.

They were also really good. He certainly doesn't seem to have lost his touch.

DOOM levels (“maps”) are grouped into “episodes” — these are the E and M numbers. B implies some sort of “alternative” to the original maps.