This discussion is a practice in textbook hubris. It is impossible for anyone to rank a coaster without having ridden it. It's fair to make guesses, but definitive statements about how an unannounced coaster that hasn't really even gone vertical yet will rank are absolutely insane.
Valid point. However, playing devil's advocate, I think coaster manufacturer, elements, nostalgia, etc. can play a role.
Many know I'm a B&M fan. Apollo's is a masterpiece IMHO and my favorite in the park (or any park), even above the soft spot I have for Nessie. Along with Nessie, my favorites in the park are the three B&Ms. (And if I compiled a top 10 for all parks, they'd all be B&Ms, other than Nessie).
In contrast, I have mixed feelings about Intamin, am not a fan of shuttle coasters, and really dislike spikes...though top hats are Ok and many of MMXX's (expected) other elements do look cool. I'm very much looking forward to MMXX and am not going to pre-judge whether or not it is a good ride or how much I'll like it.
But I do find it next to impossible that it would take Apollo's place, and I highly expect that, as good as MMXX may end up being, I will stack rank it below the B&Ms & Nessie. I'm keeping an open mind, but that Apollo's is better than MMXX will be, and that my top four won't change, is pretty definitive to me. The race for favorite #5 is wide open though; fair game to compete with InvadR, Bolt, Tempasta, and Grover. Can't tell you where it will fall in that group yet...