How they are bringing him back
I bet they are going to have a cinematic of all the rubble and wood in the water, then a hand grabs onto the pier or rubble. Gangplank raises himself from the water muttering under his breath. He will then grab an orange from his pocket. Before he eats it, he will look into the camera, smile and say "what? do you think I would die that easily?". Then he will bite the orange and laugh. After that the gold league of legends banner will show up.