Well, MacRumors has been very quiet when it comes to parts leaking for the June release of a Macbook. What is everyone's thoughts?
Well, perhaps:
1) No part leaks because nothing is really going on and we'll not get updates on June; or
2) No part leaks because nobody had access to these leaks yet.
The lack of part leaks doesn't necessariliy mean that there won't be an upgrade on June.
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If it isn't launched at WWDC (either by Tim Cook or other staff from Apple, honestly for me it doesn't matter who announces it and how, but WHEN) then it won't have new features or changes(perhaps later).
Bloomberg won't risk its reputation (as other sites) announcing such an huge upgrade without having a very, very reliable source.
Keeping the launching date a secret is a well known and good practice from Apple (as well as other companies).
Announcing at this stage a press event before or after WWDC would be a clear sign to the market and consequently the current line sales volume would drop.
At this point I seriously doubt that Apple will release a new MacBook Pro without a redesign and a Retina Display. After the Bloomberg report these rumors really seem like something serious. I may be wrong, though...