There seems to be a massive rise in Android malware. Mostly modified versions of legit applications. Again one piece of malware  contains a root exploit - the one already used by DroidDream. Many of the new trojans will try sending SMS messages to premium numbers. Other SMS trojans are just funny  as they send jokes to every entry in the phonebook.
BlackHat USA: Ravishankar Borgaonkar + Kevin Redon + Nico Golde: Femtocells: A poisonous needle in the operator's hay stack. Dino Dai Zovi: Apple iOS Security Evaluation: Vulnerability Analysis and Data Encryption. Stefan Esser: Exploiting the iOS Kernel. Anthony Lineberry: Don't Hate the Player, Hate the Game: Inside the Android Security Patch Lifecycle. Tyler Shields: Owning Your Phone at Every Layer - A Mobile Security Panel.
Don Bailey will do something on mobile infrastructure security.
Brucon: iOS Data Protection Internals by Andrey Belenko. Smart Phones - The Weak Link in the Security Chain, Hacking a network through an Android device by Nick Walker.
NinjaCon / BSides vienna: Hacking NFC and NDEF, why I go and look at it again (by myself). A Midsummer Droid's Dream (grab a drink, come around, let's reverse some malware) by Manuel Acanthephyra.
ToorCon Seattle: Scott Dunlop, Reverse Engineering Using the Android Emulator. Joshua Brashars, Owning the phone system (and why it still matters).
Defcon: This is REALLY not the droid you're looking for... Nicholas J. Percoco + Sean Schulte.
Every since Google announced Google wallet I'm getting hammered with requests regarding NFC security. Funny part about that I just was getting back working on NFC security because of the Nexus S. First bug reports already filed ;-). Due to the new rising interest in NFC and NFC security I'll decided to give a NFC security talk at NinjaCon / BSides Vienna on June 18th.