I am a student, and would like to purchase a macbook. I want to know if I should wait until January for this "ultra-portable" to come out, or is that going to replace the MBP? If it is replacing the MB, is it worth it to wait? I figured that if the new MB/P doesn't turn out to be what I'm looking for, I can always get a refurbished MB, but are refurbished computers OK? Will it work as well as any other computer? Thanks in advance!