I wouldn't mind a Tarren Ferry callback at all. I don't hate the Whitecloaks helping out, but I can't see how I'd like them saving the day. I wouldn't be surprised to see wolves involved in some way.
At the end of the day, I feel like there might be a "save the day" moment, I just hope it's not an army...I feel like it should be some kind of singular event, but I admittedly don't know how that gets accomplished. I just don't want it to overshadow the TR folk just winning from sheer stubbornness. And if they want to give the whole arc justice, there should be tangible losses on the side of the TR folk.
I don't think I've seen anything indicating the Tinkers there, but if we see Aram pick up a sword....I will give them a ton of credit for keeping that close to the vest.