As a bureaucrat, samplers may not be prohibited per se, but are probably essentially killed - assuming that the FDA bureaucrats know how to do their job. I haven't read the regulations - and not being American, I have no reason to - but the obvious area would be packaging and labelling requirements. Any sampler made up as a product to be sold would probably have to meet the same regs as any package, i.e., the same labelling/registration process as a box. Keep in mind that it is the product/packaging that is being regulated, not just the product. Coming up with an approved new package of various labels (or even sizes one would suspect) is something a cigar manufacturer could do if it wanted to, but would be beyond almost all retailers. AFAIK, single-stick purchases will still be allowed, so one could build their own sampler - but, I suspect, only in a B&M (because each box that you would pick cigars from would have the right warnings displayed).

I realize that it looks to everyone that a united front is being presented by cigar manufacturers, but the big winners in regulation are the labels that existed before Feb 2007, and big losers are the makers that have brands that came to market after that date. In other words, the survivors of the '80's-'90's cigar boom/bust are going to watch the FDA more-or-less wipe out all those new brands that have been biting into their market share.