In February, this blog predicted that Apple would update its ageing MacBook Pro line with new enclosures following the slim, curvaceous form of the new MacBook Air. Later that month, Apple released a minor upgrade to the MacBook Pro's specs, but no new enclosure. Undeterred by this setback, MacPredictions continues to believe (based upon speculation, rather than any hard evidence) that Apple is likely to redesign its MacBook Pro enclosures this year. It's just not like Apple to have an inconsistent design style across one of their lines for very long. Remember, for example, when the PowerBook switched from the titanium enclosure to aluminium. First the 17" and 12" models were released. For a few months they were sold alongside the 15" titanium model, until eventually that too switched to the new aluminium enclosure. Apple's introduction of the Air may be indicative of a similar phased rollout.
DailyTech claimed in February that Apple would be updating the MacBook Pro line again in June to introduce new second generation Penryn processors. Perhaps then we'll see the entire line consolodating on the new air-style enclosures.