Some, like Kriyananda, have stated (in his Bhagavad Gita translation) that there are indeed aliens, some positive, some negative, that they have craft not limited by light-speed, and that they travel for their various reasons...if the Universe is filled with life, which is likely, then it's rather likely that at least some have taken interest in Earth due to the Shift.

An old girlfriend put it so very well: "If we went into space, we wouldn't behave." I have to fully agree, and as such, significantly doubt if we'd do very well at all with any obvious visitors. We can't even get health care going...save the ETs for later!