When the current Ongoing series Robots in Disguise was in development, I went through a lot of design sketches for the central characters, particularly Bumblebee.
Here's one of them, and if it was up to me this is probably pretty close to how I would have chosen his design to look.
The final version I'm using for the book has some elements from this design mixed with his War for Cybertron design.
I wouldn't put too much emphasis on the title, "Cybertronian," I think that was always intended as a working title until they decided how the two Ongoings should be titled.
Just realized, I did this sketch in early April of 2011. Over a year ago now!