Google Alerts has added an additional alert type to the bundle. The new type is named "updates" and likely gives you alerts when there are matches to Google's real time search index.
Here is a picture:
Google has been tweaking their Google Alerts system to make it more selective and more relevant recently. I wonder how adding "updates" to the mix might cause those relevancy tweaks to fall a bit, if at all?
I assume if you are subscribed to the "Everything" option, you will automatically start getting the new "updates" alerts.
Forum discussion at Google Blogoscoped Forums.
