Where is the work of Gnosis?
Probably on his computer, why do you ask?
There is no work of Gnosis. This is just a copy/paste of the unfinished zerocoin release, nothing to see here.
I'm curious if September is still a realistic estimate, something tells me it's not.
September was expected date x2 by Gnosis.
I ask me why Ian Miers's team stopped working on Zerocoin for a better version named Zerocash?
And today, another coin promise zerocoin and make the news instead of anoncoin:
http://www.cryptocoinsnews.com/news/librexcoin-relaunched-zerocoin-implementation/2014/08/071. Because it's easier to implement zerocash, zerocash is not trustless.
2. Librexcoin uses zerocash, see 1.
From anoncoinwiki:
Zerocash is the name of new anonymous cryptocurrency protocol developed by some of the same authors of the original Zerocoin protocol. Although Zerocash and Zerocoin share several similarities, there are some important differences. Anoncoin will not implement Zerocash as it requires trusted third parties for the initial setup.
Pros
In Zerocash, there is only "one" currency, as opposed to Zerocoin which possesses two (the anoncoin base currency and zerocoins). Confusingly, in the paper of Ben-Sasson et al. (2014), the Zerocash anonymous currency is referred to as zerocoins, even though these are different from those of the original Zerocoin protocol of Miers et al. (2013).
All Zerocash transaction are anonymous: There is no need to convert between zerocoins and a base currency as was necessary in the original Zerocoin protocol.
In Zerocash, there are no restrictions on the amount of a transaction. This is opposed to the original Zerocoin protocol, where zerocoins are minted only for a given denomination (or set of denominations).
In Zerocash, not only is the payment origin and destination hidden in the block chain by zero-knowledge proofs, but so is the transaction amount.
Cons
Whereas Zerocoin can be set up in a trustless manner using RSA UFOs, Zerocash can not. The initial setup of Zerocash will require trusted third parties.
The total money supply of Zerocash can not be monitored. If there is a security flaw in Zerocash (either with the initial setup parameters being known or cracked, or with software bugs), this would go undetected, potentially resulting in massive inflation of the money supply.
It will probably take a couple of days to rewrite the miner, walletdb and the protocol, but I got a plan on how to do it and often that's the hardest part. 
