I'm thinking of upgrading my 2012 15" cMBP for a variety of reasons, the biggest being I'm tired of carrying it around. I'd like a lighter machine, especially since I bring it everywhere on campus. I mainly just use office, web browsers, and light apps. I assume the MB would get the job done, but is 1.2 GHz dual-core powerful enough? Also, do you think the MB could be refreshed before March? I'm not sure it'd make too much sense too buy one now if Apple will release an improved machine in less than 6 months.