HDMI is backwards compatible. There is no problem.
There have been some cases of compatibility issues, but they are usually addressed by a firmware update (yes, some TV's need firmware updates).
Personally there is nothing to worry about. Most of the cases that people report are common user error. But on the slim chance you do end up with a lemon at least you'll have manufacturer warranty or simply return it.
But like I said, nothing to worry about.
