No, but the outlook is uncertain. There's a history of solid mobile platforms being abandoned much more quickly than most would expect: Symbian, WM6, Palm, Side

No, but the outlook is uncertain. There's a history of solid mobile platforms being abandoned much more quickly than most would expect: Symbian, WM6, Palm, Sidekick (including the spectacular Microsoft data deletion screwup), so to not make contingency / transition plans now when BlackBerry is officially up for sale would be irresponsible.