True... I had to look if wiki has some new information, but no - as expected it is frozen ice of co2 and not h2o. Getting that h from somewhere to make water is still going to be an issue on Mars.
> The caps at both poles consist primarily of water ice. Frozen carbon dioxide accumulates as a comparatively thin layer about one meter thick on the north cap in the northern winter, while the south cap has a permanent dry ice cover about 8 m thick.