Pablo.
this is from the official Development Update 15th of July 2014 :
quote :
Testnet Phase
Development on RC4 is nearing an end and we expect that we’ll be firing up testnet in the coming week. Depending on what we find, testing and QA should take 2 to 4 weeks.
Code Review
Kristov Atlas has agreed to be the first to review the Darksend code. Kristov will be evaluating anonymity and overall design of our technology and will report his findings publicly. We’ll be sending the code to him soon and we anticipate that we will hear back from Kristov by the end of the month.
https://darkcointalk.org/threads/development-updates-july-15th.1788/
edit : edited in also the code review part .. which is most likely finished before RC4 gets implemented.