If you've read any articles on the Playbook, you'd see that the first models will have wifi only. Later models will have 3g/4g.
PlayBook Coming April 19, Available for Preorder at Best Buy - PCWorld
Quote:
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The PlayBook available for preorder at Best Buy does not have a 3G option, but RIM is expected to unveil 3G + Wi-Fi and 4G + Wi-Fi versions in the future. In February, RIM said 4G PlayBooks would arrive during the second half of 2011 for LTE networks such as Verizon's, HSPA+ networks such as AT&T's and WiMax networks such as Sprint's.
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This is the same as what sites have reported.