Western Digital is one upping its competition with its latest product. The company just outed a new 15TB Ultrastar DC HC620 HDD, which beats out the last year's 14TB models. While Seagate has announced it plans to out a 16TB model this year, it hasn't materialized. These aren't consumer-grade devices though but are meant more for enterprise customers who need massive storage drive densities for server and data center applications. So, yes, these will be pricey.
Source: The Verge