It has been released kernel 2.6.25-rc7 with a series of small variations and adjustments; “our” Linus Torvalds us of ago a enough complete report:
38,7% arch/powerpc/configs/
39,6% arch/powerpc/
42,9% arch/
2,4% drivers/ata/
7,6% drivers/block/
2,3% drivers/char/
2,0% drivers/message/fusion/
2,0% drivers/mmc/core/
4,1% drivers/net/
7,2% drivers/video
38,0% drivers/
3,0% fs/hppfs/
7,8% fs/
2,8% kernel/
2,0% net/

As you see the more large variations regard powerpc because of the update ones of defconfig, while for driver the changes they have been had in the drivers/block for the removal of the driver ps2esdi (considered “broken” from years), and in drivers/video with the introduction of new driver (a Metronomefb.c) for controller the E-Ink Metronome.
Besides these, the majority of the modifications is indeed little meaningful; the scheduler had some ritocco, while cifs and reiserfs some bug fixes.

It marks it near: