The president of Sony Worldwide Studios for Sony Computer Entertainment Shuhei Yoshida has confirmed via Twitter that the PlayStation 4 and PlayStation Vita will feature cross party chat. This isn't the first time that Yoshida has confirmed something via Twitter.
"Mr Yoshida I have a question. if I have a friend playing Vita can I invite him into my party chat on PS4? cross platform chat," Yoshida was asked on Twitter. He simply responded, "yes."