Hopefully they have put more memory in
Since the Opera browser needs more memory to work, and it currently uses a GBA cartridge to provide that.
There is also a rumble pack that also fits into the GBA slot, so that will also be unavailable.
Homebrew stuff normally goes on a cart that fits into the other slot behind the hinge. The TTDS is one, but there are LOTS of other DS cartridges for homebrew.
The camera seems to be on the outside of the lid (I am assuming that the hole in the hinge is the microphone), so once the DS is open how much use is it going to be? As Steven said, it's not as though cameras aren't on phone already.
Overall not a particularly compelling upgrade.
ttfn