Sent a short email to the JKLM Games folks to see what the 'release' status of Omega Centauri was relative to the information on the JKLM Games website.
In response, they were kind enough to provide the following information:
"Yes, Ascendancy is still planned for release at Essen. Pre-orders will be shipped either just before, or just after Essen, depending on how far in advance of the show we have them."
Looking "just before" pre-order release.