You can start marking up the dart board calendar with rumored dates for the launch of the BlackBerry Z10. First we heard March 15th and now Bloomberg is citing “unnamed sources familiar with the plan” saying the launch will happen on March 22nd with the devices in store then. It could be that there is a sale online or at least an announcement on the 15th like AT&T usually does but who knows. Let the rumor mill churn on!