It's just speculation, no different than people talking about it in a forum. Shinobi (GAF) said there are no such talks in place atm and that the news is just that, speculation.
RAD also expressed, previously, a desire to remain independent. That can change, but I don't know if it'd happen right away.
Few days ago Ru gave a speech at Dice about being an independent studio, I doubt getting bought is anywhere in his mind right now. Maybe after this generation.
RAD is set on making sequels to The Order anyway, and the IP belongs to Sony, so whether they are bought or not they'll still be acting as if they were a first party studio for a few years.