See the announcement:

https://lists.ubuntu.com/archives/ubuntu-announce/2016-November/000215.html

and subsequent pages:

• https://wiki.ubuntu.com/Kernel/LTSEnablementStack
• https://wiki.ubuntu.com/Kernel/RollingLTSEnablementStack

The TLDR is there will be a GA kernel that will only get updates in the LTS, and then an HWE kernel, which will be rolling.

Here's the hwe tag for people interested in submitting updates/fixes to our old answers (I would start with the high traffic ones first!): http://askubuntu.com/questions/tagged/hardware-enablement-stack