When the BlackBerry PlayBook training guide was leaked last month, it included a slide showing a Mini Bluetooth Keyboard described as being "perfectly sized to fit the same footprint as the BlackBerry PlayBook tablet," with availability listed as "summer 2011."
Shortly after that, BlackBerry Rocks produced a blurry photo (below) of what seems to be the actual keyboard depicted in the renders. The large palmrest beneath the keys, the size in relation to the hand holding it, and the BlackBerry logo to the right of the spacebar are a dead giveaway, though keep in mind that even if this is the real keyboard, it may not be the final version.
It would be nice if the final keyboard was designed so that you could carry both together and protect your PlayBook's screen at the same time. Maybe there will be a folio case that will allow this.
Until we find out more information, I'll stick my Bluetooth keyboard and mouse setup.