I understand that. And I'm quite confident they could have a working build in a couple of days as well.
My "software development" comment (a bit harsh, I'll grant you) was predicated on the assumption that Apple would actually test said implementations.
Look at how much flack Apple catches from you lot for even the slightest UI aberration. Do you honestly think that they could implement MMS, copy and paste, and video all in a couple days, and still have time for thorough testing?
Testing something like MMS would need to be tested on authorized carriers' networks. Something like copy/paste would require changes to be made to input and UI classes used by every application. When you're mucking about with something that every app depends on, you want to make damn sure you test it before you roll it out. Video recording? Yeah, that one _is_ easy to implement and test (live encoding might take a bit longer to implement well, depending on the iPhone's hardware -- IIRC it's only got MPEG-4 decoder chips, not encoders.)
Given the media attention that the iPhone draws, testing has got to be an important part of the development process. As a result, no, they couldn't have all three of those features developed and ready to go in a couple days.
