I believe they are not afraid of what they saw.
Here is why (this is my point of view, these are not FACTS :)):
We already know that the CPU is going to be equivalent if not superior. And regarding what seem to be a "big deal" for certain about this DDR5; I do not see why Microsoft could not go for DDR5 too at the last minute like Sony did. Or if people believe that Sony kept this fact secret from everyone, Microsoft can also do the same.
At the end; from my point of view, Sony did not reveal anything exciting about the PS4 other than updated specs from PS3; I see Microsoft coming out with more than that. And when they saw Sony's conference it could be perfectly reasonable to believe that they are not afraid at all knowing that they already get something better (in their minds at least).







