Galaxy Edge has little to add to what will be open for those two weeks. The first week of Dec has, for a long time, been the highest
DVC demand week of the year at WDW, and the second week of Dec is the third highest (Christmas week is second and if you are considering "early Jan" note that Christmas week for DVC demand usually includes the night of Jan 1, and even 2 and 3 when Jan 1 is on a Friday, Sat or Sun). For 2018, all rooms at AKV were missing 4 to 7 nights a week for the first and second week of Dec at 7 months out. Particularly for the first week of Dec, even SSR has a probability of having at least studios with multiple nights missing at 7 months out.