I've been reading a few articles and watching a lot of videos about this.
I sort of see both sides, but it strikes me as a bit of overreach by Gibson, considering Dean has had some of these styles in their lineup for four decades.
There are seven complaints Gibson has against Dean: the shapes of the Flying V, Explorer, ES and SG guitars, its “dove wing” headstock plus its Hummingbird and Moderne trademarks.
My personal sense?
Dean may lose a couple of these challenges, particularly the infringement on the Hummingbird. As I understand it, Dean uses a hummingbird in one its acoustic guitars.
The body shapes question leans more against Gibson. Fender lost a similar legal battle a few years ago and Gibson lost that battle against PRS.
The Moderne question is a little iffy, as I believe this pits Dean's split V headstock versus the Moderne offset V headstock.
Personally, I think the "dovewing" headstock question is stupid.
This the picture
@eSGEe posted earlier. On the left is Dean's Dovewing. On the right is Gibson's open book.
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However, Gibson has pushed for a jury decision. So, this will not be decided by judges. It will be decided potentially by non-guitarists.
I suspect Gibson is already losing in the court of public opinion.
What may work in Dean's favor is that Gibson has not previously pursued action against Dean, in spite of Dean having had some of these products on the market for decades.