Touma and Misaki have met before does seem very heavily hinted.
...But why do people immediately jump to the conclusion that they were
osananajimi 
?
Also given how she worded things, I wouldn't be surprised if this was
one-sided even WAY back whenever and kamijou never actually knew who she was
So it's not over yet
Wilf
EDIT:
Also, if it's about the cover I'm guessing that they're planing to put all the Level 5s on them in these three volumes.