In its report detailing the corporate shakeup at RIM, the Wall Street Journal also seems to confirm that the company is hard at work on an update to its PlayBook tablet. The article doesn't specify whether this is the previously-rumored 10-inch Black Forest tablet or something else altogether, but the wording certainly suggests a hardware update. Along with the first BlackBerry 10 phone, the Journal says the new tablet is one of the company's "two biggest projects," so hopefully we'll be hearing more soon.