The answer is no. At least, not anytime soon. Mainly because Microsoft said themselves that they are not currently working on their next console. Here's what President Robbie Bach had to say about this "nextbox":
“Just coming up with something that’s faster and prettier isn’t going to be sufficient. The life cycle for this generation of consoles — and I’m not just talking about Xbox, I’d include Wii and PS3 as well — is probably going to be a little longer than previous generations.”
