I don't think this will happen yet, what would make sense to me is if Apple waited until they manage to get streaming movies and TV shows in iTunes, upgrade to 1080P in iTunes, and THEN update the

TV. No point updating it if iTunes doesn't have the content yet is there?
I appreciate that (common) perception, but I would think the opposite makes more sense: for hardware capabilities to lead software. After all, if a Studio wanted to test 1080p content for

TV today, the test would miserably fail. Why? Because there are no

TV's in place that could play that content at 1080p.
It would be like believing we have to have all the DVDs or BDs in the stores first before there are any players. If there are no players, that's just wasted shelf space and ZERO revenues. Get the hardware in place and some Studio will be tempted to test whether 1080p content can be profitable via

TV. Until the hardware is in place, NO Studio can test this.
Apple does this "hardware first" thing with just about everything else they make. For example, new Macs tend to have features that will take a while for the software to fully exploit. New iPads rolled out with resolutions above native iPhone apps; software had to catch up. New iPhones rolled out with double resolution; software had to catch up. In all of these cases, one could say that the better hardware offered the OPTION to the software providers to "catch up". And that's the case here too. 1080p software for

TV added to the iTunes store today is like rolling out Mac software that depends on Macs equipped with 16-core CPUs: can't do much with better software unless the hardware is in place.
Ideally, both arrive at the same time. But since Apple only has real control of the hardware, they can lead with this, get lots of units into homes and let the volume of capable units tempt some Studio to test 1080p content in iTunes. Lots of movies didn't come out on BD until there were lots of BD players in homes on which to play those movies. The opportunity motivates the Studios to play.
Besides

TV can do a lot of things besides just rent iTunes content. In my own case, I could care less if iTunes EVER has 1080p content. I just want it for many years of precious home movies shot at 1080, edited on Apple software, databased in iTunes (where they play just fine), but difficult to push to the living room 1080p TV. Apple gives us all the tools for 1080. All that is left is this last little link in the chain.