I spun up an EC2 ubuntu 14.04 instance a few minutes ago - a quick check shows sh -> dash. Are your systems fresh installs or dist-upgrades from older systems?

I spun up an EC2 ubuntu 14.04 instance a few minutes ago - a quick check shows sh -> dash. Are your systems fresh installs or dist-upgrades from older systems? I wonder if there's a difference there somehow. Or perhaps your puppet/chef/etc rules are changing to bash?