Collider has posted information from an interview they had with Lorenzo di Bonaventura, where the producer talked about some of the directions and details of next year's Bumblebee-focused prequel movie. Perhaps the most noteworthy is the suggestion of having only a couple of robot character, and spending a lot more time with them, a concept he seems to link to a "departure" from the movies thus far. We've highlighted certain passes below, and you can find a link to the original article as well - keep reading...
“In fact it reminds me a little bit of Iron Giant years ago when I did that movie at Warner Bros. It just reminds me a little bit of that where it was very contained and yet it didn’t feel small.”
“I know we’re doing a spinoff first in the Bumblebee movie, and that is a very distinctive departure from what you’ve been seeing so far… The objective of that movie is to develop more time with less robots in a way, and to go back to 1985 and go back to sort of the original heritage if you would of the Transformers. G1.”
As for the “less Transformers” line, di Bonaventura stresses the distinctiveness of Bumblebee, and just focusing on just one or two Transformers in the course of a film will be a very different kind of dynamic from the previous movies
‘Bumblebee’ Spinoff Compared to ‘The Iron Giant’; 1985 Setting Confirmed - collider.com