Don't wait for rundisney notification emails.
Pay attention to the Events/Competition forum on the WISH board here, and get on rundisney's Facebook page.
They haven't announced Everest, and they aren't going to announce TOT until well after THIS year's TOT happens. When you go to rundisney.com and click on Events, it will show you all the events. You can see what they have announced in the future by looking at the dates.
rundisney events are expensive, they sell out fast, and you pretty much have to be right there at the computer ready to go when they go for sale! (usually noon eastern time, 9 pacific, etc)