There will be a minor gem release (pre/beta/something) next week that supports Riak 1.0 features, then in the next major release those will also bubble up to the Ripple document layer. Sorry for the delay.
Most of the HTTP and PBC apis are the same so everything that has already been implemented should still work. I know they haven't added official support for secondary indexes, but I hacked them together real quick here: https://github.com/highgroove/ripple
I think I heard next week sometime the 1.0 ready ripple will be out. As others have said all clients will work with riak 1.0, they just might not support all of the new hotness.