Programming language for GIMP fork's rewrite

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On Sunday, 1 September 2019 at 19:51:58 UTC, Clipsey wrote:
> On Sunday, 1 September 2019 at 18:57:07 UTC, Kamran wrote:
>> Hello everyone,
>> People who forked GIMP, a popular open source image editor are 
>> discussing on which language to choose for their rewrite at 
>> [1] and they are considering D. Maybe some of you can help 
>> them out.
>>
>> [1] https://github.com/glimpse-editor/Glimpse/issues/70
>
> Oh hey, I didn't expect this to be shared here, haha.
> Yeah we're considering D, though i'm the main advocate for it. 
> So sadly there's p big chances that Rust will be chosen over D.

I'm a bit confused; OP said that it's a rewrite, but looking at 
the readme on Github:

What is different about Glimpse?
For now, not a lot! The initial aim is to provide a downstream 
fork of the GNU Image Manipulation Program that has a less 
problematic name so there are no potential barriers to using the 
software in businesses and educational institutions.

This is a long-standing problem that has drawn user concern for 
over a decade, but whenever the issue is raised it tends to be 
dismissed. We do not believe the upstream project's explanation 
or workaround is enough to address the problem.

In future versions we intend to address other long-standing 
complaints, particularly around the graphical user interface.

How will the package versions work?
Glimpse 0.1.0 will be a simple re-branding of the GNU Image 
Manipulation Program based on version 2.10.12, with some minor 
fixes to the UI and build system. You can see how this effort is 
going in the dev-g210 branch.

We will stick to following upstream releases until we "hard fork" 
at v3.0. After the hard fork we can be more ambitious with our 
changes.


It looks like it's only a rebranding for non-technical reasons, 
unless this rewrite is part of the aforementioned "hard fork". 
Can I ask you to clarify?