A couple of our RIM sources have informed us that the new BlackBerry Bold 9800 slider will be making its public debut in June on AT&T. The BlackBerry 9800 is a slider phone where the screen slides upwards to reveal the usual BlackBerry style keyboard underneath. The Bold 9800 will sport a QWERTY keyboard as well as a full touchscreen, giving the Bold 9800 phone everything you need to work productively on-the-go.