Not too much is known about the 4G LTE version of the BlackBerry PlayBook except that it will apparently have a dual-core 1.5GHz processor under the hood, and offer support for NFC. There is some talk that the 4G version of the tablet will be equipped with BBM. The current version of the tablet is powered by a dual-core 1GHz TI OMAP 4430 CPU with a PowerVR SGX540 on the graphics side.
Back in December, we told you that a BlackBerry PlayBook 4G Evaluation Unit was purchased on eBay. The 4G tablet comes more than a year after RIM originally introduced an LTE enabled PlayBook and one designed with HSPA+ connectivity. Then Co-CEO Mike Lazaridis proclaimed that the pair would be available in the second half of 2011, but never materialized. A WiMAX powered model for Sprint customers was canceled by the carrier due to poor sales of the original unit. Last December, 4G and 4G LTE icons for the BlackBerry PlayBook were discovered in the tablet's 2.0 OS Developer Beta indicating that RIM was still looking to produce a 4G variant of the device.
source: CanadianReviewer via Engadget
A recently leaked photo of the BlackBerry PlayBook 4G with 4G icons found in the tablet's 2.0 OS Developer Beta