frostbite - industry buddies (television industry, that is) advise that, indeed, the future has NOT been decided upon and some receivers MIGHT NOT receive the final product.
The battle seems to be between a transmission of 720p or 1080i. A 720p receiver will not work well with a 1080i signal - but a 1080i receiver will work with a 720p signal (or even the current 480i [USA]).
Answer - get yourself a 1080i receiver and all will be well (whichever system they eventually settle for). Would be a bugger for most, though, if they settled on 1080p (which they won't).