Features

Feature	Description From	Contributed By	Made Release?
VPC	Inter-VLAN Routing	Citrix	Y
S2S	Site-to-Site VPN	Citrix	Y
Tagging	AWS style tagging for CloudStack Resources	Citrix	Y
Local Storage	Local Storage Support for Data Volumes	Citrix	Y
Auto-Scaling	Automatically scaling of user VMs using NetScaler	Citrix	N
NVP	Nicira NVP Support	Hugo	Y
Ceph/RBD	Ceph/RBD Support for KVM	Wido	Y
EC2/S3	EC2 and S3 API support integrated into CloudStack	Citrix	Y
Brocade	Brocade Load Balancer support	Brocade	N
Caringo S3	Support for Caringo as S3 provider	Caringo	Y
Nexus 1000v	Support for Nexus 1000v	Citrix		Y

License Changes

License Change	Reason
Removed Hibernate specific code	Hibernate uses GPL
Removed MySQL specific code	MySQL uses GPL
Changed all source code headers to ASL 2.0	Source code was GPL previously
Removed binaries from source tree	To comply with ASL 2.0
Removed third-party jars from depo	To comply with ASL 2.0
Switched to Maven	To auto download third party libraries during build

The QA Test Plan for 4.0 is here.