I signed up for this and can not wait! Hopefully I am in the 1 million, I signed up straight afterWWDC.
I would like to install on a separate partition but I have a bootcamp partition already on my rMBP and when I installed DP2 on a separate partition it messed up my bootcamp one and made it unbootable, I later found this to be a common issue where if you have a bootcamp partition then you mess with the partitions it will mess up the bootcamp one.
I managed to recover everything in the end and I am back to how I was but that was a confusing day.
Just a warning for people in my position, if there is a simple way round this I would love to know!
I will be installing Yosemite over Mavericks then as I do not need my laptop that desperately at the moment as I am a student and it is holidays, I also have Time Machine if it all goes wrong.
Can you do a clean install of Yosemite over Mavericks WHILE preserving that Bootcamp partition just the way it is?
I'm in the same boat as you and I've been having problems with screen flickering on Chrome on Mavericks (doesn't happen with chrome on windows via bootcamp or from safari on Mavericks)