>>12166>>The "dream" need not necessarily refer to the events of Rebellion, theoretically speaking.
Yes, that is certainly possible—in a technical sense anyway. However I think the fact that the dialogue occurs in the opening to Rebellion that the most likely interpretation is that it does indeed refer to the events of Rebellion.
>>Homura may have literally dreamt of Madoka before her soul gem corrupted. There's also Homura's soul gem tumbling in the picture which could support this.
Yes, and that's a very good point. I'm starting to agree more and more with >>12158
about this. It seems most likely that it occurred during the events of Rebellion, but before her change to Homucifer (as evident by both her tone of voice, as well as the soul gem)