It will allegedly be possible after you meet a certain person who's name starts with a W. Which was early in EA, I was usually lvl 2 at that moment. Don't know how expensive respeccing will be. As far as I know respeccing is confirmed with the exception of changing appearance. They may block certain changes because of story reasons. However it would be very strange if you could change Wyll into a Rogue or Gale into a Fighter but couldn't change a cleric subclass. It would be better to be not able at all to change companion stuff, then.
I don't want to violate the lore too much. So I'm interested in reasons about in what you could change her why, as I'm not a DnD player and lack the necessary knowledge. Trickery domain is not my favorite Cleric domain, but you can play with it (the lvl 5 domain spell is great), so it is not mandatory to change her.
