Now there's the million-dollar question! I'll try to answer as best as I can, but before some people clobber me, I'll put out this disclaimer: I'm in no way a CITES/USFW expert, so this is just my understanding based on conversations with folks who know a thing or two about CITES, imports, and USFW.
First and foremost, this closes down all future import of kaiseri to the U.S. It likely wont matter if the kaiseri are listed as captive bred from European stock, etc. unless the European party has paperwork tracing back to Iran. This does not exist, according to Iran.
I believe it also closes all interstate sales/crossing of animals across state lines without federal permits, but may be wrong there. Within-state sales should still be possible.
The biggest question to me is, how closely now will USFW look at kaiseri within the the context of the Lacey Act. Afterall, Iran says no kaiseri have ever been legally exported from Iran for sale/resale. Just because a bunch of animals labeled as "captive-bred" were allowed to be imported from the Ukraine and elswhere the past few years, this does not mean USFW does not have the authority to consider past commerce illegal in light of new information. Animals mistakenly or incorrectly determined by USFW as legal at the time of import do not constitute legal imports. At that point, all that 3-177 really does is prove you weren't necessarily trying to pull a fast one.
It will be interesting!