reading the 1.1 "what's new" here, http://www.datastax.com/docs/1.1/getting_started/new_features, I'm wondering about row level isolation.

two questions:

1 does this mean that a batch_mutate that first sends a "row delete" mutation on key X, then subsequent insert mutations for key X is isolated?  

2 does isolation span column families for the same key  within the same batch_mutate?