FUD Zilla heard phones with dual-core ARM processors will arrive next year:
What you have seen with Zune HD, might be coming in 2010 in the next generation mobile phones. This is what ARM has shared in one of its presentations. Mobile Client 2010 as ARM calls it, should come with Cortex-A9 dual core CPUs that can work all the way to 2GHz, but in mobile devices they might end up clocked at more modest speeds.
The development process for these chips are 40nm as well as 32nm most probably both from TSMC as Globalfoundries might not be ready for production of these chips in 2010.