It's also more closely tied to the cloud, saving documents to Microsoft's SkyDrive storage system by default, so your documents and personal settings are remotely accessible.
But the most high-profile change is expected to be Apple's announcement that it's replacing Google Maps with its own mapping app as the system's default.
Such high spreads usually occur when the fear of defaults is high, but given the excess liquidity in the banking system, a default wave does not appear to be in the offing.