Microsoft update their page on Reservations and Server Subscriptions in CSP to reveal that there will be two new offerings available in the short term: Reservations for SQL Managed Instance, and Server Subscriptions for RDS CALs.
Find the page and its host of useful resources here: http://bit.ly/2NIC5n1.
Azure Reservations are a way of pre-paying for an Azure resource over a one or three-year term to get the most cost-effective pricing. The Reservations family continues to grow: it started with Reserved Instances, a way of pre-paying for Azure virtual machine base compute, and was extended with Reserved Capacity, a way of pre-paying for Azure SQL Database compute capacity. Today the family also includes Software Reservations for SUSE Linux software, and Reserved Capacity for Azure Cosmos DB throughput.
This page (http://bit.ly/2Q3vm7J) gives you an overview of Reservations and if you expand the “Buy a reservation” link at the left you can get details on the current four members of the Reservations family.
You can buy an Azure Reservation to save money on the infrastructure charges (compute) for virtual machines or Azure SQL Databases. After purchase you can make adjustments to that reservation: change the Subscription it applies to, split a single reservation into two reservations, add or change users who can manage a reservation, and optimise for VM size flexibility or capacity priority.
Find a useful article with instructions here: http://bit.ly/2PnMOUC.