Nick TMNT panel at SDCC 2014

[Vicky82]

Originally Posted by BabyTurtles

that doesn't seem that big of a change for someone stranded in dimension X for months.....but I guess I kinda expected that, it's not like they were gonna totally change his attitude....

but just figuring out a new thing....and defeating one monster doesn't seem that much different from normal Mikey.

Watching the trailer, (where Mikey says that the Kraang invasion is no big deal), it doesn't look like Mikey's attitude will change and he still be the fun, loving turtle just probably bit more mature and can focus more.