Looks like Freeform gave Shadowhunters a season 2.
Jace Wayland (Dominic Sherwood) looks to get a bigger role, more of the lead role in the second season.
Clary Fray (Katherine McNamara), Jace Wayland (Dominic Sherwood), Simon Lewis (Alberto Rosende), Alec Lightwood (Matthew Daddario), Isabelle Lightwood (Emeraude Toubia), Luke Garroway (Isaiah Mustafa) and Magnus Bane (Harry Shum Jr.) will all still be the main cast. But we might get a surprise visit of Will Herondale sooner than expected.
Ed Decter the creator of the show said, there are 15 books they can turn into seasons. So there will always be enough to tell and they could always write other stuff if they want too.
Katherine McNamara had the lead in the first season but Dominic Sherwood is set to become higher now, we'll see darkness, pain and fights of him in the second season. It will be great.
This is all still rumored. But u can expect a great season.