#1 No involvement of Becky Lynch or Charlotte Flair

This past week on RAW, WWE Chairman Vince McMahon suspended Becky Lynch and removed her from the WrestleMania match against Ronda Rousey. Becky does not have a match for Elimination Chamber (duh, she's suspended!) while Charlotte Flair also does not have a match this Sunday.
But, it would be a huge disappointment if WWE did not have one of Becky or Charlotte (or both) at Elimination Chamber to hype their match with Ronda Rousey.
Rousey is in a hastily put together match against Ruby Riott, which does not quite add up or is going to be a long-term feud, hence I think there is a possibility of Charlotte appearing ringside to watch the match, while Becky could also come through the crowd and attack Flair.
The rumour mill suggests that Becky will be added to the WrestleMania match and that it will be a triple threat match involving Charlotte, Rousey, and Lynch for the RAW Women's title, the seeds of which could be sown this Sunday!