Even if there is an API for app specific custom sounds, it would be something for app developers to implement. It's a bit early to expect the app developers to have implemented something for an unreleased version.
Comparing apps between iOS/Android/WP8 I can guarantee you that none of these apps would be updated overnight if the API were there. Most apps for WP8 are way behind on updates/features for their counterparts on other OS's.there are no api additions with GDR3 so my point stands.
...and believe me, if there WERE an API for this, developers like Whatsapp would have it implemented overnight because it is a core feature they support on other platforms. This is not some case of "we'll see if developers want it/support it" ...lets not start reciting that crap. This is a case of developers are crippling their apps on WP currently because it does NOT support it.
I know that you can now set custom tones for text messages and such....what about notifications?
Also, is there a separate ringer volume from other system sounds?
I'm looking for a reason to upgrade to GDR3. So far I can't find any.
Glance is not a real notification center.notifications are coming to glance and now with the unique sounds....what more do you want?
I still don't see how you set a custom EMAIL tone for a contact. What am I missing???