A case redesign was expected to happen back in February 2011. Instead, the Macbook Pro received an "under the hood" update which included a whole new processor series (Intel Sandy Bridge), graphics, larger hard disk space and Intel's new Thunderbolt I/O. Although the update was much welcomed, it was disappointing that the aging design remained unchanged. Don't get me wrong, I believe the current MacBook Pro series have a brilliant aesthetic design, but it is time for a change.
There are many rumors circling around on how the next MacBook Pro design will look like, but unfortunately we do not have any clear indications. Most likely the new MacBook Pro will follow a similar design to the new MacBook Air (released in late 2010). It will likely be thinner and lighter (this will not be suprising as Apple is obsessed in creating thinner products). The screen resolution is also expected to increase. Other rumors speculate that the DVD drive will be dropped and the hard drive will be replaced with flash memory.
It will be interesting to see what Apple has up it's sleeve for the upcoming MacBook Pro series.