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Apple's existing OS X operating system supports Hi-DPI mode, allowing for Retina displays in future hardware. But will Apple push for hardware with greater resolution screens? Supply chain sources understand Apple will, but others are sceptical due to the power consumption increase, but if the new MacBooks include the same battery technology as the iPad, it could work.
And to keep things on the hardware side of things -- since it's a developer conference, OS X 10.8 "Mountain Lion" is also expected to feature heavily during the week. We have mobile covered and it's likely the desktop will hold a prominent position during the meet.
Let's have a spin through what could be coming during the week.
iMessage on the iPhone, iPad, and iPod touch allows you to send free unlimited messages to other iOS devices. Apple will expand this functionality to the desktop, allowing you to keep your contacts and devices in sync wherever you go. You can send a message from your iPhone and see the reply on your account-linked Mac or iPad.