New

The new Load Balancer API (and ManagedChannelImpl) is now default; the previous one is removed (#2656)
The authority header is now included when looking up methods in the HandlerRegistry (#2709)

Changes

Downgraded Guava to 19. This should help avoid ABI problems with older versions of Guava
Fixed a bug with connections dropped due to HTTP/2 settings frames (#2820)
Upgraded to Protobuf 3.2
~~Fixed an error when using keep alives with Netty (#2729)~~ Edit: the feature is still broken (#2828)
SETTINGS_MAX_HEADER_LIST_SIZE is now sent in the initial HTTP/2 settings (#2350)
Fixed a race in the server start and shutdown when using Netty (#2672)
Indexes for server reflection are consistent for the duration of the RPC. (#2767)