I am in the same boat. I love Chance and I am so happy she is getting Icon status.
1) I don't think they would do the circus theme again. Most likely the new theme will be tied to whatever backstory they have come up with for her as far as why she is solo now. Maybe she is locked up in an asylum or prison and has taken control? Not the greatest look though for merch and stuff. The circus/freakshow theme lends itself very well to great visual elements a lot better than a cement wall from a prison.
2) I expect her to get the same treatment Jack got last year. She will be the center of it all. Billboards, commercial and most of the merchandise. I hope she gets a house. A show is all but guaranteed after the success of last years. Honestly with the hashtag Universal is using, [HASHTAG]#DareToChance[/HASHTAG], all I can think of is a twisted game of truth or dare being the theme for the show. If it does take place in a prison, we can see a prison overrun for the house and the stage show could be that she and some friends captured guards and are forcing them into a deadly game of truth or dare.
3) This is my biggest concern. Jack needs to be left out of it. I'm fine if they mention him but I don't want to see him in anything. Again, with the prison or asylum theme, it would be cool if Jack appeared the last night to break her out during the final stage show.
At this point, we know nothing. Did she get locked up? Did Jack piss her off and now she is out for revenge. I suggested a multi-year story months ago where Chance got pissed off at Jack for not letting her be the center of attention for a change. A fight happened that left Jack injured but still alive. Chance decides to round up some of the other Icon's over the next few years to finish off Jack once and for all during the 30th placing the spotlight back on them. While I highly doubt they would do something this in-depth now (maybe 10-15 years ago), it would be cool to see her kill off Jack down the road (would be a milestone year like 30). Anything is possible at this point and hopefully tomorrow we get a lot of info. I hope it's not like the short teaser we got last year with Jack walking down the hallway until you see his full new look. I want backstory and details as to why she is solo!