The Ardor roadmap says it will be launched in the third quarter of 2017. Is that for certain, or might it be launched sooner if the coding and beta testing gets completed faster than expected? If the devs complete the product early there's no reason to wait for months before launching it.
All is communicated so it is not good to change it. Besides that, its better to have a long testing period where the Coredevs, community and the to become new Child Chain owners can test really good so the mainnet launch will be great.