The class has been largely developed since the Beta spoiler from a few weeks ago. It now offers more defined mechanics, more balanced values, and conditions put into place to prevent it from being too outrageously overpowered (especially regarding travel through portals during combat).
Besides the class description says they deal damage and heal allies and we know they use portals so, map manipulation. I think it's fine for conclusions to be drawn. It's not like the people who guess wrong are horrible people for it. Either way the servers are gunna be packed full of them on release day