You now decide how often notifications reach you by email, so you only get the reminders that matter.
The notification email bundles everything from your Notification Center into one summary. You pick the pace: every 2 minutes, every 20 minutes, hourly, or once a day at 3pm.
Fewer emails, more relevance: instead of a full inbox, you get exactly the summary that fits your workday.
You'll find the setting under your Profile Settings → Notifications.