The power dip reminded me FD2R Civic Type R
Coming from zzt231 Celica, it too has a dip right before lift, i never feel it. Driving such car all i have to do is rev it and maintain speed at powerband the whole time. I cannot be lazy and unaware of what gear I'm at. Makes driving the car aggressive and rewarding, to me at least.
I haven't got my GT86 yet, but that power dip wont be a real issue i think. Most of the time in city driving don't you all shift at 3000rpm? And when you floor it the dip quickly passed anyway. If not, a couple of downshift would land you back to the powerband. The powerband of this car is looks to be overall much better than my Celica for sure, but i will find out soon in December if Toyota keeps its promised.