In any case... to my great surprise it turns out that the version released by Shout Factory (the only official release there is) is actually quite different from the bootleg version everyone has grown accustomed to.
I've tried to compile a list of all the differences Ive found between the two versions (so far it's over 60 editorial changes) but quite frankly I havnt heard any one else talking about this - despite the fact that a lot of horror fanatics are really excited about the film finally coming to Blu-ray. Im not sure if this comparison is something that can be included in the rewind database but I think it's quite curious that it doesn't seem to be mentioned anywhere at this point (even imdb doesnt mention any alternate cuts but then again the blu-ray just came out so maybe no one else has noticed yet).
I would love to hear if anyone else knows more about this or if you have noticed something I've missed in my comparison.

You can check this url to see all the differences:
http://www.discjunkie.se/thepoughkeepsietapes/
UPDATE 2018-01-07 :
I was able to get in touch with director John Erick Dowdle and ask him about the changes and he actually explained it to me. Heres what he said:
"The cut we screened at Tribeca in 2007 is the same as the Blu-ray cut. The bootleg was our film festival submission rough cut which was never meant for public viewing. No changes have been made since 2007 when it was sold to MGM. It always pained me that what people saw of the The Poughkeepsie Tapes wasnt the film as we intended it. The finished version (as seen on the Blu-ray) is what we first premiered and the film as intended."