Doesn't look like it's discovered.
When you screenshot something on the phone, it's actually numbered correctly now.
Example, I just screenshotted and the picture is:
IMG_0245
Before 3.0, whenever you have a screenshot, say IMG_0244, and you delete it off the phone, the next screenshot you take would NOT pickup where the phone left off, and instead, whatever is missing, which in this case at 244.
Another example, say you have 001, 002, 003, 004, and 005 on the phone. If you take 001, 002, and 003 off the phone, but leave 004 and 005, the next screenshots you take would be 001, 002, 003, and 006 respectively...picking up wherever there's a spot.
ALSO, it seems the screenshots go into the same folder as the regular pictures now (100APPLE.) Normally, when you screenshot, it would go into 99APPLE.