I'm not entirely sure how or why this happened...but when Mike announced 2.0.16 I duly upgraded having regressed back to 2.0.14.
Now I don't don't know if it was how I did it, I did upgrade via the plugin panel, but all of my shop settings were reset, all pages vanished, payment gateways, shipping, everything wiped.
I'm now attempting to restore everything including database from last night's backup. So I would caution people upgrading pending more regression testing as I believe this release needs more testing. Or at least make sure you've got a backup before upgrading!