Why does Bitcoin not implement anonymous transactions feature? It would definitely be huge if it is implemented!
Also, if such features are not implemented what does BTC have apart from being the first and accepted by a large number of merchants? So why not implement the newest features from altcoins?
Though the core code doesn't have anonymity, projects like Dark Wallet make it possible to spend Bitcoins anonymously.
Except it isn't so atm, because Dark Wallet is not ready yet. Dark Wallet is presently in alpha, v.0.5.0, still a ways to go.
https://darkwallet.is/Also, it should go without saying, that's a wallet project. It will at least provide stealth and coinjoin as a natural part of any DW transaction, and will be used with Tor, but it currently doesn't offer what could properly be described as anonymity.
For that, a change to the bitcoin protocol (something like BRS (or alternatively zerocash in alt, then in bitcoin testnet)) would be needed, and imho, should appear as an option similar to how SharedCoin is presented as an option in blockchain's GUI.