I don't think DHS will even be mentioned until D23 2017, as I doubt plans have been finalised yet.
With DHS, it feels like Disney is conducting a social experiment - do people come to the parks for their content, or the characters? How low can an attraction count get before people stop coming or stop spending? Once they know that, then they can know the minimum they need to build to get attendance and spending up to the level that maximises profit.
Lights Motors Action and Indiana Jones have been rumoured to close for the last couple of years, so it's possible they'll give a few months to see how not having Animation affects things before closing those too. Then they need to watch crowd patterns while they have the Osborne lights. Will people still come when there's less attractions to see the lights? We know attendance is down, but so are running costs so less guests could still mean greater profits, so Disney will be watching carefully to get the ratio right.
Only when all that data is in, when everything that can be closed has closed, can they lock in a plan for the future and start construction and announce anything.
By D23 2017 however Avatar will be open, Shanghai will be open... there won't be much left to promote if they don't start some work at WDW. It sounds likely to me that they will make WDW the focus of D23 2017 the same way Shanghai is the focus this year.