Publicity released this morning via email and
social media highlights that, to quote, "the Barcelona route is on its way". "We’re excited to share that the much-anticipated Barcelona night train is becoming more and more concrete. Preparations are in full swing, and there’s likely to be more GOOD news very soon." It is, of course, a plug for donations, but it sounds positive nonetheless.
Also includes the following, which is the first official hint at the expected stops en route (it may or may not be an exclusive list), and seems to confirm that Amsterdam is dropped (as hinted at previously):
Brussels – Avignon – Montpellier – Narbonne – Girona – Barcelona