I rather doubt you will see this in quality name brands. They specify the composition of their products (or they should anyway).

If it's stamped 18/8, for example, that's what it will almost certainly be. Even the cheap no-brand stuff used to be 18/8.

If it's not stamped or name-brand, though, it's buyer beware. Note that this new stuff will be usable in a lot of situations, especially for casual use; but I wonder about the effect of, say, a salt-water environment.