The only notable change is that, starting now, there is going to be a submission limit of one submission per day. This is to prevent people from submitting their entire galleries and drowning out other member's art. Since many members don't submit more than one picture a day anyway, for most, this won't even be noticable.
While I'm at it, here's a friendly reminder of the submission guidelines.
1. If it's not clean, please put a mature tag on it.
2. Only submit your own art. The only exception is for guides/tutorials.
3. Keep it at least loosely pony related. That includes humanized ponies, but at least try to make them recognizable as the pony it's supposed to be.
4. Be nice to the other members and stay constructive. Remember criticism is meant to be constructive. Any flaming will not be tolerated.
5. Make art and have fun!
That's all for now! Happy arting everyone!