Dask does not have "experimental Arrow integration". It supports using Arrow to read Parquet files but no Arrow-based computational functionality.
Semi-related question: How do you expect Arrow to be integrated to the larger data science landscape?
Will it mostly be used as a go between format? Will new libraries using it internally and old libraries just reading and translating it to a native format? Do you think established libraries will change their back-end to arrow? Is that even feasible with e.g. Pandas (or are you too far from their governance now to say)?