There's lots of rumours about a lot of people who are just friends online if you look in the right place. I think these two are playing up their friendship for the publicity though. For some unknown reason the press seem to want to make Cara tabloid fodder.
They won't make her 'tabloid fodder' via Rita Ora. The already tried to link her with Harry (twice) before and Jake Bugg and no doubt others but she keeps going out with Rita.
Good for them.
I also heard this from what I consider to be a very good source. If so the papers will of course carry on with their usual, 'pals' schtick, like they do with certain other people.