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New MacBook Pro, MacBook Air with Intel "Haswell" processor
WWDC is typically a software-focused event. Though the software has to run on something, it's not likely that any substantial hardware-related products will be announced until later this year.
From Apple's Q2 earnings call, chief executive Tim Cook said that the company will launch new products during the third quarter, but hinted that most of the release cycle will in fact fall in 2014. This suggests the "next big thing" — whether it's an Apple branded television, or more likely a watch — will be on the cards for next year, with minor existing hardware iterations coming later this year.
According to KDI Securities analyst Ming-Chu Kuo, who has previously accurately predicted a number of hardware releases ahead of time, such hardware tweaks may include Intel-based next-generation "Haswell" processors in Apple's MacBook Pro and MacBook Air range. These will be upgrades to existing systems rather than any substantial design change.