No they're not. RIM has denied the rumors in several locations.
The rumor was started by a chip analyst (not even a consumer products analyst) and he was basing his rumor of off semiconductor production from one of RIM's suppliers.
"Rumors suggesting that the BlackBerry PlayBook is being discontinued are pure fiction," RIM spokeswoman Marisa Conway said in an emailed statement. "RIM remains highly committed to the tablet market and the future of QNX in its platform."