The kernel gets a new logo

Thank you for info sharing about new mascot. When Rusty Russell submits
new linux images to Linux Git tree (2.6.29-RC8 git tree),
I received email about this news with gitstat software.

But, It's strange.
He didn't change "logo_linux_mono.pbm" file from old linux image to new image(devils).
(git address is http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-...)
What is reason that he didn't change mono(black/white) image?
Anyone explain me?.. RSVP, Please.

I summarized changed logo images on 2.6.29-rc8 git tree currently.
* logo_linux_clut224.ppm (224 Color) <---- Changed
* logo_linux_mono.pbm (Black/Hite Color) <--- Not Changed
* logo_linux_vga16.ppm ( 16 Color)<---- Changed