Fanoush,
I think I know what's up with the mmc's switching. The device nodes for the mmc's are reversed between the initfs and the root fs!

If I do-
# cd /mnt/initfs/dev && ls -l mmcblk*

I get-
brw------- 1 root root 254, 0 ..... mmcblk0
...
brw------- 1 root root 254, 8 ..... mmcblk1

if I do-
# cd /dev && ls -l mmcblk*

I get-
brw------- 1 root root 254, 8 ..... mmcblk0
...
brw------- 1 root root 254, 0 ..... mmcblk1
...

The nodes are reversed. mmcblk0 is 254, 8 and mmcblk1 is 254, 0. I'm going to make the initfs /dev entries match the root filesystem and see if it bricks my tablet. I'll post back in a bit

kernelpanic ;-)