I hear they are planning to bring Shantel back this season.

She isn't really an actress. She only played Draco's wife because she and Tom were already together at that time and the producers thought it would be cool, and from what I read she had to be persuaded to even play that small part. She works on movies behind the scenes- can't remember what her actual job title is though. I want to say she works in casting?
I remember someone theorizing that Julian's girlfriend is Patty Spivot, and that thanks to Flashpoint she and Barry never got together. That would be interesting.
What the hell is a Stiles?

It would be so awesome if the show brought in Jade Olivia. It is my understanding that she and Felton are actually in a relationship at the present time, so I can't see why not. Unless she isn't in Vancouver.

It was actually his philosopher's stone which he uses to blast lasers and gives power to metas.