Apple (NSDQ: AAPL) invited reporters to its Cupertino headquarters for an event March 6 to lay out its software roadmap for the iPhone. The SDK was expected to be released by the end of February, and even now the invitation isn’t a sure sign that anything will be released next Thursday. The invitation said: “Please join us to learn about the iPhone software roadmap, including the iPhone SDK and some exciting new enterprise features,” according to Reuters.

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