All Things Must Pass 50th Anniversary sets due to be announced tomorrow

According to Bobby Whitlock who played on the LP the original came out sounding just the way George and Phil wanted it too. That big sound they got made it a massive hit. When Harrison left Spector his sound and sales fell untill he turned to Jeff Lynn who also used the big sound approach.
Remix, remasters are usually other people's  interpretation of what the music should sound like and wanting to keep it in the public eye for financial reasons.

Dhani Harrison and Klaus Voormann in a Rolling Stone article:

Equally fascinating, the core All Things Must Pass has been subtly remixed — both to bring added sonic clarity to Spector’s lovingly dense and echo-heavy arrangements and to adhere to Harrison’s own wishes before his death in 2001. “He hated the reverb,” Dhani says. “He said this to me a million times: ‘God, that reverb!’” Voormann also recalls Harrison making similar comments to him years later about the multiple overdubs: “I remember him saying, ‘It’s too much,’” Voormann says.

George Harrison’s ’All Things Must Pass’: Inside New Reissue - Rolling Stone

@tomcy6:

Some "added sonic clarity" would be most welcome ! ! ! 

@stuartk, 

Yes it would.  Early reports are that it comes with a healthy dose of compression, unfortunately,.  Give it a listen with an open mind and make up your own mind, as always.

tomcy6

which 50th package did you purchase? CD or LP?

Happy Listening!