While I can read all the information about Requiem on the website, I want to know what, if any, traces from the Masquerade to Requiem. Can anyone help me out?
There are no connections between the two. Nothing that happened in Masquerade carries over to Requiem. While there are some obvious similiarities between the worlds and their history, technically Requiem is a whole new game in a whole new world.
Just skimming Requiem, it looks like the major changes involve less clans and the addition of "Covenantes" that cross through clan lines. It seems that in general the clans are not political powers in themselves, that being the function of Covenantes. There are five clans - Daeva (Artsy Succubi types), Gangrel (beasty types), Mekhet (Discreet and wise), Nosferatu (Strong and terrifying), and Ventrue (Aristocratic).
The basic powers seem largly the same, though some of them have been renamed. There are a few new ones that weren't in the core book for Masquerade, but I don't know as they are "new".
As someone mentioned, probably the biggest change is that the Cain Mythos have been removed. No one really has any information on where Vamps came from.
Some minor changes -
Vampires do not have reflections. If you attempt to photograph them, it comes out blured. Vampires can stop this effect with an act of will.
Vampires do not have souls, and can not feel true emotion. All emotion is caused by echos/memories from past experiences of the emotion, created by the tattered remanents of of the vamps soul. IE, if a vampire never experienced love before the embrace, they can not experience it after.
There's a bunch of other stuff. Generally it looks like the same themes are there, it's just the details that have changed.