Do you think it will be a shard? If so, who will it be? We know autonomy (Trell) has already been a villain of era 2, and ruin was era 1. Say who you think and why - I wanna hear what you think.
On the Coppermind, it says that it will have a strong focus on Kelsier and Trell. This points toward trell being the big bad, or maybe even Kelsier???
Imagine if Kelsier becomes an avatar/vessel for autonomy!!!