Basically, type who you want to leave or return, and introduce new characters.

Here's myn:

Corrie:

Departing (killed off)

Fiz Stape (2017)
Tyrone Dobbs (2017)
Lauren (2017)

Departing (leaving)

Simon Barlow (November 2016)
Billy Mayhew (Late 2016)

Temporary departures

Todd Grimshaw (2017)
Pat Phelan (TBA, faked death)

Returning

Rosie Webster (2016)
Stella Price (2016)
Gloria Price (2016)
Katy Armstrong (2016)
Linda Hancock (2016)

Guest returns

Maddie Heath (2017, ghost)

Emmerdale

Departures (killed off)

Robert Sugden (November 2016)
Liv Dingle (December 2016)

Departures (leaving)

Tracy Shankley (2017)

Returning

Katie Sugden (TBA, ghost and kills Robert)
Andy Sugden (TBA)

New

Rebecca White (October 2016)
Sarah White (October 2016)

Corrie

Departures
Robert (Leaves for job in high profile restaurant, 2016)
Izzy (Moves to Portugal to be with Katy & Linda 2016)
Caz (Jailed after conclusion of the Maria Storyline, 2016)
Yasmeen (Leaves for fresh start after discovering Sharif's Affair, Early 2017)

Returning

(Other than those already confirmed)

Ryan Connor (2016)
Martin Platt (December 2016, recast?)
Kirsty Soames (December 2016)

New

The Forrester's / Henderson's (New Family For The Rovers)
Paul Henderson
Charlotte Forrester
Tyler Forrester
Lorna Forrester


Emmerdale

Returning

Faith Dingle (2016)
Hannah Barton (November 2016)

New

Greg Lake (2017) Late Twenties
Sophie Lake (2017) Late Twenties
Riley Lake (2017) 4/ 5 Years