Apparently that one was never partnered with the Wikimedia Foundation, and was kind of its own site (just running on the same software). This one is officially connected to the Wikipedia community. Most of the content is being brought over from the other site, but it'll be edited and updated on Wikivoyage from here on. I think the expectation is that this will be much more actively developed with the visibility that the Wikimedia Foundation brings to it.
In 2012, a large portion of the editing community left and brought their contributions to the Wikivoyage project, which was relaunched as a Wikimedia Foundation-hosted project in January 2013.