It'll probably be a few weeks before anyone hears anything. I'd expect no sooner than mid-August. Last year they also didn't reach out to people who weren't selected, so it's a little stressful wondering for a few days if they'll contact you or not.
But it also seemed different this year; the announcement of the program was quieter, the UI for the assessments was different (better in my opinion), so maybe they've made some changes. I'd like to think that throwing together a generic email to send out to people who didn't make it should be fairly straightforward.
I imagine given the program wasn't around for a fair few years that they may be kind of relearning how to run something like this.