After wasting time searching the forums I finally called Adobe Tech Support and learned that feature promoted in PE10, "Burn Blu-ray quality Hd movies to affordable DVD discs using standard burners" is misleading. I expected that Adobe had figured our some way to use existing DVD players to support HD, but no. The fact is that PE now supports three types of DVD players; legacy players, the new 1080I players and, of course, Blu Ray. A bit useless if you are trying to distribute media ...who know what kind of player they have.
Adobe should have been clear in their promotion and said: "IF YOU HAVE A NEW 1080 PLAYER USE THIS MODE" or something like that in their promotion.
Video edition is confusing enough without Adobe adding to the mix.
No. DVD players cannot play HD material - only BD players.
Sorry for the confusion there.