In a leaked internal document from Telus, received by BlackBerry Empire, it seems that an "unannounced" BlackBerry phone named the BlackBerry Z20(Manitoba) will be replacing the BlackBerry Z10 coming this fall. The document states that BlackBerry has stopped production on the BlackBerry Z10 and BlackBerry Q10 and "will no longer be accepting orders for those two products."
We are awaiting official confirmation from Telus on this so please stay tuned and check back soon.
Source: BBE