I'm sure the studios pushed back on Apple for 1080. I'm also sure Apple didn't have the server capacity at the time.

Tom, I'm seeing a lot of people saying Airplay will connect over Bluetooth. I don't think I can test that out with only an iPad and iPhone though.

Keynote remote for the iPhone will work with an iPad, so you don't need a computer at all. And it will work over Bluetooth as I've seen reports and specific instructions for this as well.

I've also seen one person talking about playing the presentation from an iPhone connected to a projector and running the remote app on the iPad.

You could potentially alo use wired headphones or BT headphones with buttons if they're supported in Keynote to advance/reverse slides. The ultimate is still the Airplay setup, and IMO, if it can't be made to work over BT, it's worth carrying an Airport Express and AppleTV. Of course it's only software changes necessary to obviate the need for the base station, since Apple could create an ad-hoc network with the iPad (or AppleTV), allowing the other device to connect to it, even automating the process for a direct-link Airplay without an underlying third device providing the network.

You can also use a mouse or pretty much any other BT device with an iPad, but it will require a jailbreak and BTStack.