Exchange 2013 Room Lists exist.
To get a list of all the room resources:
get-mailbox |? {$_.resourcetype -eq "room"}
Just as mailboxes can be part of a group/distribution-group, the room resources can be part of a group/distribution-group. These are groups do not show in the ECP.
To get a list of all the roomlist groups:
get-DistributionGroup |? {$_.recipienttypedetails -eq "roomlist"}
To create a new roomlist group:
New-DistributionGroup conference-rooms-foo -RoomList
To add a member to the roomlist group:
Add-DistributionGroupMember conference-rooms-foo -Member foomember1
To get a list of all the members of a roomlist group:
get-DistributionGroupMember conference-rooms-foo