Yeah, I updated the data for S15 a few days ago already - but I don't swap the Journey Tracker before the season has ended, since there's always some people who do it last minute. Now that season has ended, I've switched to the S15 view. As usual we won't know the boss names except for the ones you pointed out. Apparently the data is too difficult to access for Nevalistis, so we'll have to fill in the blanks ourselves. I definitely will miss the season start, just not sure by how much - maybe I'll be just 5 hours late, maybe a few weeks. Last season it took me 8 hours solo (after a power level) to finish Guardian, so maybe I can complete all the info by Saturday evening. We'll see. If anyone is faster post it here and I'll update the tracker.
Have fun everyone in S15!