Good news for a change.

[W. H. Heydt]

I have the WD SATA carrier up and running with the root filesystem on an attached 60GB SSD. It's running the full Raspbian Jessie (i.e. bigger image than will fit in the 4GB eMMC). The next step with this device will be when the CM3 comes out. For those interested, here's what the system is looking like:

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pi@pi-sata:~ $ lsblk
NAME         MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda            8:0    0 55.9G  0 disk
|-sda2         8:2    0 55.8G  0 part /
mmcblk0rpmb  179:96   0  512K  0 disk
mmcblk0boot0 179:32   0    4M  1 disk
mmcblk0boot1 179:64   0    4M  1 disk
mmcblk0      179:0    0  3.7G  0 disk
|-mmcblk0p1  179:1    0   60M  0 part /boot
|-mmcblk0p2  179:2    0  3.6G  0 part
pi@pi-sata:~ $ df
Filesystem     1K-blocks    Used Available Use% Mounted on
/dev/root       57491944 4012496  50848032   8% /
devtmpfs          218416       0    218416   0% /dev
tmpfs             222688       0    222688   0% /dev/shm
tmpfs             222688    4644    218044   3% /run
tmpfs               5120       4      5116   1% /run/lock
tmpfs             222688       0    222688   0% /sys/fs/cgroup
/dev/mmcblk0p1     61384   20368     41016  34% /boot
tmpfs              44540       0     44540   0% /run/user/1000
pi@pi-sata:~ $

This is a "pure Raspbian" setup. No Berryboot or anything like that. The boot partition on the eMMC points to the root partition on the SSD.