I think someone lied to you, Vincent. From what I’ve seen (and suffered), the differences between Premiere CS4 and CS5 are vast. There are several documented bugs in CS4 (that I encounter all the freaking time) that Adobe decided not to fix, instead opting to address the issues only in CS5, so you have to upgrade ($$$$) for the fix. It’s kind of infuriating.
I’m experiencing further problems right now with even just trying to use a plug-in (Colorista Free only works in CS5). I purchased Colorista in July 2009, which is simply AWFUL in Premiere CS4 –the color wheels are like trying to move boulders and there is NO PRECISION whatsoever; less than a year later Colorista II drops and I’m left with a buggy product (Colorista in Premiere CS4) that I can’t get help with.
Also wondering where you heard CS6 for summer of 2011, considering it’s summer of 2012 and we still don’t have it.
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This is my life, I edit and edit and edit and edit…