The real Zerocoin developer is not even finished with the code yet to create his coin release called "Zerocash".  Both of these new coins, Dreamcoin and Libertycoin, came out of nowhere at the same time, both having the words "Zerocoin" in their announcement titles.  I went investigating, wanting to invest in one of them if there was any hope of decent returns.  I went to Dreamcoin first and discovered the coin dev has already made something like 4-5 coins in the past year, Timecoin, Hashcoin, Matrixcoin, etc.  He's basically a serial coin cloner and his last coin was just released in April.

Some people managed to contact the Zerocoin anonymity function creator himself on twitter (lots of different posts and info there):  https://twitter.com/secparam/status/465971947386720256

Both coins are advertised "Zerocoin" while having absolutely no Zerocoin functionality, or even close to it.  At best this is false advertising, at worst it's a scam.

Then there were claims of "working with the Zerocoin devs" to implement it in Dreamcoin, here is the Zerocoin developer's official response:



Next you have the problem that Zerocoin has EXTREMELY complex security vulnerabilities where you're basically required to have absolute trust in the coin creator or he can easily pull Asiacoin type frauds on you.  You do not want ANY kind of Zerocoin functionality except possibly from the Zerocash dev himself, and even then, it's still sketchy.  The only Zerocoin implementation that will ever be trusted is Zerocash, created by the Zerocoin dev, and even then, most security experts will still probably not trust it due to it's double spend security hazards.