He's ambitiously working on a more viable alternative, whether it's color coins or ripple based.
Just to be clear, it is
NOT ripple based. Ken has stated that it is based on a colored coins implementation.
Source:
Working on our Colored Coins Program.
We will be using our own technology to keep track of the last sale price, bids and ask. The colored coins will only be used to store the assets.
...
We will be trying to use a lot of the technology in our new site in our colored coins development. We expect that our colored coins development will generate additional revenue for ActiveMining.
Savvy?