Amidst all the excitement about the new Apple announcements yesterday (Penryn Macbooks and MacBook Pros, plus iPhone 1.1.4 firmware), many were left wondering just where the heck the promised iPhone SDK had gone. After all, we’d been promised by Steve Jobs himself that it would appear in late February. As it turns out, Apple will be holding another of their Town Hall-type events on March 6, which will specifically deal with both the iPhone SDK as well as “some exciting new enterprise features.” On the invitation itself, you see a Software Update sign, an SDK sign, and an Enterprise sign. Yeah, fairly vague, we know. Still, it is a promising sign. Now we just wait for March 6.