It will be a non-cosmetic upgrade with bumps in processing power and possibly RAM. This is in direct opposition to what MacRumors has been reporting. Talk of a completely new chasis design has been coming from that camp for quite a while now.
There haven’t been any hardware shortages or time delays to indicate a drastic change, but Apple has been known to silently push CPU upgrades and we could see this happening in the next month or so.
Either way, if you’re eyeing a new laptop, we suggest giving it a few weeks for this rumor to be confirmed or denied. You’d hate to be running last year’s CPU when the new one drops a month later.