I've already read ahead on what Mashu's secret was so that thing that was revealed in Camelot didn't come as a surprise, I also kinda have read on what's going on based on snippets of discussion I've seen online so I have a general idea of what's going to happen, including that flowery white mage shown in the last few seconds.
What I didn't expect was me grinning ear to ear on seeing "Rin" in anime form. This might be the first time ever that I know stuff from the source material even though I gave up on FGO during Orleans