What do you mean weaker than 360/ps3?
Based on reported specs,
The cpu will be better running an IBM power 7.
The graphics card will be better running at least amd 5000 level card
1.5 to 2gb of memory
and using Blu Ray like disk
Yea it might have a 8GB hard drive, but that does not mean much other than storing games/DLC.
It is about 3x times more powerful than this generation.
Not to mention, based on some of the specs of the next Xbox and PS4, you might not be seeing the biggest jump for next generation. Heck the xbox is rumored to have an atom proc and a low end amd 7000. Depending on which one they choose may not even beat out the 5000 of Nintendo Wii U.
I know the Wii was under powered, but the Wii U is not. Yes the next Xbox/PS might have a little more power, but its going to be like dreamcast/ps2 compared to the xbox in terms of difference.
In this case, this is EA trying to get madden out and not wait a year. like the first 360 Madden, it will lack features because they are not used to the Hardware and are not going to skip a release to learn it.