If you've logged in to yours in the last few days you'll see your subscribers are at 0. Or BIG FAT ZERO NO FRIENDS as I've dubbed it.
I have no idea what is happening because for every article I read about it there is another one with opposite information. It's doing my head in. Is it going to be shut down completely? Will it just not be updated? Is it just the API being discontinued? What does API even meeeeaaaaaaan?
Mostly what I can hear are the mournful screams "WHERE HAVE ALL MY SUBSCRIBERS GONE?"
Relax. Despite the BIG FAT ZERO NO FRIENDS thing, the details of the people who subscribed by email are still there. But I have no idea how long they'll be there for so I'd suggest you go backup your email subscribers now.
How to backup your Feedburner email subscription
Step 1:

Step 2:
Step 3:
Save that CSV file somewhere safe! When you open it (with excel or similar) you'll see it's the email addresses of your lovely subscribers that you can now port over to whichever service you choose to use. Or email them to tell them you've stopped hyperventilating.
Even if this whole thing settles down, your numbers come back and the collective trichotillomania ceases, having a backup isn't a bad thing.
Are you freaking out?