Question about Movie Prequel Issue #1 and Soundwave

Almost overflowing with glee at this week's arrival of my first ever Soundwave toy, I decided to revisit Soundwave's spotlight issue this evening, and I even read the five-page preview of Movie Prequel #1, despite buying the complete issue a fortnight or so ago.
Anyway, my question. Why is Bumblebee's comet form drawn completely different in the Soundwave spotlight than to how it actually was in the issue? The actual published Movie Prequel that I bought (the full-colour edition) has this artwork:
http://www.newsarama.com/IDW/Tformers_m ... re_02.html
but in the Soundwave spotlight he doesn't look like he does above. I don't have an image to link to, but in "Soundwave" Bumblebee's comet form has guns, the apparent 'wheel arch' above is absent, he has red and yellow 'lights', he has what resemble intakes on the side, there's more detail compared to the blurry one above, and the whole design of the detailing is radically different.
Panel 2 is also different in "Soundwave" than to that above (as are the captions).
Why is this? Apologies if this has been explained before.
Anyway, my question. Why is Bumblebee's comet form drawn completely different in the Soundwave spotlight than to how it actually was in the issue? The actual published Movie Prequel that I bought (the full-colour edition) has this artwork:
http://www.newsarama.com/IDW/Tformers_m ... re_02.html
but in the Soundwave spotlight he doesn't look like he does above. I don't have an image to link to, but in "Soundwave" Bumblebee's comet form has guns, the apparent 'wheel arch' above is absent, he has red and yellow 'lights', he has what resemble intakes on the side, there's more detail compared to the blurry one above, and the whole design of the detailing is radically different.
Panel 2 is also different in "Soundwave" than to that above (as are the captions).
Why is this? Apologies if this has been explained before.