I really liked the Sentinal-Blackarachnia scene when he discovers who she is. Show some real depth to his character, and gives some explanation to why he is a jerk and his attitude towards Optimus. Also a bit of his attitude towards Magnus for not letting them go back.

I am curious though as to the current status of the Dinobots. I am sure they will pop up somewhere but they would have been within the radius of that explosion. So a couple of things could have happened
a) They went with Blackaracknia and Waspinator to where ever they are now
b) They survived and got thrown somewhere Team Rocket style (or are just in the water near the blast zone, but Optimus and co were thrown a fair bit...)
c) They are, Primus forbid, off-line