Meanwhile, many of the more than 5000 developers estimated to be attending the event, are salivating over the rumored prospect that Apple will introduce some APIs for Siri that will allow their apps to tap into the software.

A cosmetic change has also been predicted for iOS. Its current blue interface may become silver.

If an iOS6 announcement is made, you can be sure that it will be scrutinized minutely for any tips it might hold on what the next version of the iPhone will look like.

Prognosticators also see some hardware fireworks occurring at the developers' conference. Apple's portable models— and Air—may be updated to retina displays and Ivy Bridge processors, as well as slimming down some and gaining better battery life. MacBook Pros may also get a boost in its discrete graphics subsystem.