They already said Ilum rework is slated for January.
I wouldn't call a new daily area, Hk--51 and new world boss just fluff, though.
They never said the ilum re-work is coming January, in fact they've completely ignored it and havent mentioned it for like 6 months. What they DID say was that an event would occur around january (and that it could be delayed), that would involve a ship crash landing on ilum. It is completely unrelated to a permanent re-work of the zone.