Here I can help you as I'm a founding member of the project. I can't get too technical because until it is finalized we are keeping it closed source. Also donors get the most technical info and the first crack at new releases so I can't say too much. But anyway it IS NOT just a "well let's try this next" thing as StealthBravo mentioned. We have a plan of what we plan to implement. Everything. Every bluetooth profile that the chip can support we WILL add eventually as they are all specified in the Bluetooth Core v2.0 + EDR spec. We will start with basic things like OBEX but the base for all of that is rfcomm which we are implementing now, but I can't give a date because we don't know for sure. Unfortunately A2DP is the most difficult and also probably the last thing we will implement. As usual donors will get the first info so if you can donate, if not just keep checking our awesome Cydia host MMi and checking out our ibluetoothproject.com forums.
Best Wishes,
Geniusdog254
Lead developer, iBluetooth Project