So my friend and I went to Craglorn last night to make use of the re balanced difficulty. We went to the observatory, went through the quest there and spoke to the Celestial. After returning we finished out that quest but was not given the next phase. I checked the Wiki, and the next quest in the main story should be given by a man named Erold who is supposed to also be in the observatory. He was missing for both myself and my friend. In the chat I also saw others mentioning they could not find him. Just in case I also rebooted and he was no where to be found.

Also, I had several quests active for Craglorn before the update yesterday and had done quite a bit pre update. It seems they were all removed from my quest log and it the entire area was reset for me. Even the Wayshrine was no longer considered having been discovered. I thought this was likely intended, and may or may not have anything to do with why I am not able to progress in the main quest.