It is out but for linux only.
If you want to use it then follow the instructions here:
Locating Bitcoin's data directory
The data directory is the location where Bitcoin's data files are stored, including the wallet data file.
Gnu/Linux
By default Bitcoin will put its data here:
~/.bitcoin/
You need to do a "ls -a" to see directories that start with a dot.
If that's not it, you can do a search like this:
find / -name wallet.dat -print 2>/dev/null
To change the directory Bitcoin stores its data in:
Run in terminal or script: ./bitcoin-qt -datadir=./[Directory_Name]
-----------------------------------------------------------------
Once windows is available tomorrow they will tell you to do this so to backup your wallet (testcore) to have the new minexcore to work with what they have built already:
Backing up just your wallet file
Follow these instructions to backup just the wallet.dat file. This results in a smaller disk image, but it's more complicated to do.
Open Disk Utility
Click New Image and choose a big enough size, 128-bit or 256-bit (faster or more secure) encryption and single partition.
Save it somewhere you won't lose it (like your Wuala, Dropbox, Strongspace or whatever)
Choose a safe and strong password
Move your wallet.dat file to the image
Symlink it back so the app would be able to use it
ln -s /Volumes/Bitcoin/wallet.dat ~/Library/Application Support/Bitcoin/wallet.dat
Mount Wallet and launch Bitcoin
Don't forget to mount your image before using Bitcoin and unmount after quitting it.
Note: If you start the Bitcoin application without having the image mounted, the application will overwrite your symlink with a new wallet. If that happens, don't panic. Just delete the new wallet.dat, mount the image, and recreate the symlink like above.
Automation: You can create a small application using Automator (included in OS X) to automatically mount the wallet and then launch Bitcoin App. See the Screenshot on how to do this.
If one doesn't want to use encrypted Disk images, then a small shell script can be used instead that takes care of decrypting the wallet, launching bitcoin client, and encrypting it after the client exits. This script works on both OSX and Gnu/Linux: bitcoin-launch-script
All reference from the here:
https://en.bitcoin.it/wiki/Backingup_your_wallet#Windows