I believe it supports them, just like it supports game controllers now, but apps will have to include their own implementation of support to actually make use of them. It doesn't seem that iOS 7 supports using a mouse/touchpad by default throughout the OS itself.
Looks like apps can only support arbitrary Bluetooth devices if they're the Bluetooth Low Energy type: http://stackoverflow.com/a/11892685. Conventional Bluetooth devices would have to go through the MFi program to be supported by App Store apps.
Nor can I get it to work with either an iPad or iPhone 5 running iOS 7, using a MS BT Notebook mouse or Apple's own BT trackpad. The devices don't even see the pointing devices (or more accurately, they see them but they're not telling me in the UI). I've got an Apple BT mouse lying around somewhere that I'll try, but I doubt the results will change.
Not just mice and keyboards either, Android has a surprisingly large number of devices and device types supported. Even I am left surprised at what "just works" on an Android device.
Why are the endless, tedious contribution like this not downvoted to oblivion as being offtopic? The topic is IOS 7, if you want to talk about Android start your own thread, failing that, take your witless preaching elsewhere.
BT keyboard has been supported back when original iPad was released. But BT mouse hasn't so far. If it is supported, then I think iPhone 5S could have the potential of being the first pocket size workstation.
Wait, what? If this is true, it certainly hasn't been talked about much.
Edit: I should be more straightforward — I don't believe this is true.