Hi AirplaneRandy, I'm going to try to help answer your questions. For more complete details, go to
this section of the forum, specifically you may be interested in
this thread.
Sound holes: On the bottom now. The LCD has been expanded to basically take up as much space as possible in the lid, meaning no room for the speakers. You can see them in that other thread I linked just above the nubs.
The ridge: it helps keep the LCD from touching the keyboard and stuff. The 3DS XL doesn't have one, just those rubber feets, but as a result, when it is closed, it leaves this gap that is easy for stuff to jam into. It's an aesthetic trade off and while I can't officially speak for EvilDragon I'm pretty sure he's going with the "solid when closed" look similar to the Pandora. You can see it in the video in that other thread.
4 Shoulder buttons: yas, it do.
D-Pad: I don't know if you've used a Pandora before or are just going on looks, but if you have then I think you're in the minority for not liking it. The Pandora's D-Pad is the most comfortable one I've ever used and it would actually make me happy (in a way) if Nintendo stole its design. I know there's a lot of people that have said similar.
Keyboard: I can't find the post now, it's buried in the Pyra News section (or possibly I am misremembering) but I'm pretty sure ED said it would have a matte finish. The keys are translucent to allow LED backlighting, it would kind of defeat the purpose if they were also very shiney.
ABXY game buttons: topic of much debate here. I don't think ED has decided what to do yet but there's no end to suggestion threads around here.
The oval indent: gone.