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Zouaves continued on the US side for duration of the war, as I understand it. The Confederates couldn't supply the uniforms, so historically, they are limited to the beginning. Still, they are really cool, and I think there would be a great deal of interest in them. Whether Strelets goes that route will depend on how their other offerings sell.
Here's a question: do you prefer realism or romanticism: would you rather have shabby rebels, barefoot and hairy, or, well, Louisiana Tigers and frockcoats-and-havelocks? Personally, I prefer the latter... but that's me...
In this scale bare feet can be done with just paint, if there was a set with Havelocks and frock coats I'd buy them, always dreamt of a Manassas diorama with early war troops, Union troops in grey and so on.