Think the closest thing to that at the moment is Tether, USD₮, EUR₮, and JPY₮.  It uses the Omni (formerly Mastercoin) layer.  I've seen USD₮ on the Poloniex exchange, but haven't come across the others.  

As for what's next, hopefully some talented coders start creating stuff to utilise this new feature and wallets start updating their GUIs to handle it.  This will result in increased resistance to regulatory shutdown (exchanges are easy to shut down), increased privacy (no need to register accounts and submit to KYC/AML) and increased security (not relying on third parties to store funds and you'll have full control over private keys for the pairs you're trading in) once it's all up and running.  All things that we should be striving for.