Bear in mind that this is only a very early media preview of OS X Lion and that Apple does not traditionally reveal all the juicy details of its new OS X releases this far in advance.
So there's no doubt more to come. For instance, Jobs hinted at some new features and APIs coming across from iOS to enable things like instant-on, the automatic and implicit saving of files and state-preservation on quit, none of which was described in any detail.
So I highly doubt that what we saw yesterday was the sum total of the innovations and updates that Apple is planning for Lion.