Well here is some more Bumblebee concept art, this time from multiple people.
First we will start with an artist who has already shared art with us, Joshua Viers also known as conceptbyjosh, he has shared some early Decepticon head designs which eventually led to Dropkick's final head design, you can see the whole "speaker" mouth concept was planned for at least awhile as according to the description in the instagram post.
"Quick Decepticon head concepts for #bumblebeemovie . The director had some specific ideas that were fun to play with."
Source:
https://www.instagram.com/p/Bsgxja1lnws/Although the final design looks great itself and probably fits more with the "G1" like designs of the other characters these ones are still good looking on their own.
Compare with the final version in the film.
Next up we have another concept artist Thomas Pringle (Pringleart) who has done work on Transformers in the past, recently The Last Knight but has done other projects such as A Quiet Place and Star trek Discovery.
Only one art piece for now with presumably more to come but probably the most revealing one, art for a frozen Megatron with a different design, not quite G1 inspired like the ones in the final film or as describe by those who saw the Test Screenings in March but it is a much more rounded design and certainly one that clashes with the depiction in the 2007 film.
Much more is that the date for the art piece is 2017, 03, 28 which is March 28 in 2017, so they were possibly toying with reboot or redesign ideas before The Last Knight even hit theaters, this is a good example of how much time it takes to develop the behind scenes and development art for movies and a good reason why for Hasbro's movie toys tend to draw from concept art rather then final film stuff.
Even further backed up by the description on Instagram.
"A concept i did for the Bumblebee movie a few years back."
Source:
https://www.instagram.com/p/BsgCY2sFc21/The final art for today comes from artist Tim Flattery who has done some work for previous Transformers films such as The Last Knight and even the original 2007 film not to mention his other work.
There is a lot of photos so I'll only post a few after the description but from top to bottom we have art for the "arm thing" that Bumblebee drops from his undercarriage when Charlie first works on him in her garage in the film.
Then we have have our first look at the "Allspark mutations" that were originally supposed to be in the film when Bumblebee accidentally got "Allspark Engergy" on the electronics in Charlie's house causing them to come to life and trash the house, ultimately despite the props for the creatures having been made and the scenes presumably filmed with other reports that Martin Short was to lend his voice to the scene, it was cut from the film and instead Bumblebee trashes the house all on his own, however one element of the film remained in an odd line from Charlie's Mom about why the Tv cord was cut.
Then we have some art and some pictures of the props for a couple of Sector 7's equipment in the film, first we get a look at the Harpoon guns that were used multiple times in the film at the start and the end, then we get a look at the "Electric Gun" that Sector 7 use to disable Bumblebee at one point in the film and Charlie used to "revive" Bumblebee after Dropkick shot and left him for dead, this electric gun resembles a Grenade tube launcher somewhat.
Finally we see some pics of a Bumblebee head and chest prop with notable focus on the "eye" design.
The source comes from his website
http://www.timflattery.com/work/bumblebee/ and I'll post one picture for each of the concepts that I just talked about.
Final art, although this has been up for a bit I couldn't find any page sources for the art itself but according to others the art is from Mark Yang who did do some work for The Last Knight and it fits his art style so it's probably true.
So while I wouldn't add it to a news article until the source is found I wanted to share the art regardless, these are near final designs for Blitzwing, Shatter and Dropkick with only some slightly different proportions and different but very similar head designs to the final film.
Although Tfwiki has the art on their page for the artist so maybe they have a real source
https://tfwiki.net/wiki/Mark_Yang
Like something that walked out of Half Life: Episode 2. This just proves what some bold artistic risk balanced with practical design can achieve in the live action visual realm, and frankly makes all the vanilla G1 takes look boring and outdated by comparison. I realize the filmmakers didn't feel like they were "resigned" to recreating G1 onscreen, but with enough more GEEWUHN! in ALL of our evergreen pop culture franchise, we're all going to start feeling the burnout soon. This would have been a dose of fresh air to keep my hope alive. As it is, now we pretty much know what all of the characters are going to look like for the next several films at least (I mean, what's the risk they betray their G1 "mandate" so soon?).
Though using G2 Turbo masters and Predator Jets as cast would get around continuity issues 
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