Interesting article I came across about the new iPad:
http://news.cnet.com/8301-1001_3-57...-for-the-third-generation-ipad/?tag=cnetRiver
Would be interesting if this was true and if Apple faces a similar issue with the upcoming MacBook Pro. Perhaps Apple is pushing for a full redesign but are facing production, design, or supply issues- could be anything from possible new battery/power management system, Retina display or IGZO displays, slimmer design issue. Maybe, just maybe, Apple would deem the redesign unfeasible to meet the June or Summer release date and instead, release a spec bump with the same chassis.
Simply said, even though iOS devices > Macintosh in terms of focus, sales, profits, etc., Apple still doesn't want to lose their edge or niche over the computer/laptop industry to PC. If they push a release of anything whether a redesign or a spec jump past June or Summer, they'd be losing too much to competing IB desktops and laptops, sales from students, etc.
In terms of the "lack of rumors or leaks", I totally agree with you that its been quiet and some of you may have even bought refurbed 2011 models already- trust me, even I debated that ($1700-1800 for a BNIB 2.4Ghz 15" Late-2011 MBP is tempting). However you cannot compare the "amount of leaks" of MacBooks with the iPhone and iPads. iPhones were allegedly left behind in bars blah blah blah. Pretty hard to leave a 'MBP prototype' behind or really, find the need to take it outside to test anyways. iPads were mainly leaked from inside sources in Foxconn. MacBooks, if I remember correctly, are made elsewhere in Shanghai, China, NOT by Foxconn. Its facilities are under much less pressure, attention, and heat from the media.
Last thing worth mentioning... I love how all of the sources or "news" on the 2012 MacBook Pro surrounds the image of the two adjacent hard drives and larger battery. I mean really... a poorly photoshopped, out-of-proportion image from Reddit is the best source we have? I should totally photoshop a MBP logo on a potato and send it to Slashgear so I could make headline news