I thought Spielberg didn't want any HD DVD releases and had a fit when Uni posted "coming soon" with Jaws and ET to where they had to retract that as a "mistake"??? Some are listing the HD and BRD versions as cancelled now instead of just TBA dated.
It took forever to get DVD releases of his work (same with Lucas), so I wouldn't doubt if this TBA goes on and on and on for some time to come. I'm hoping for sooner rather than later, but I won't hold my breath, either.
I'd much rather have ET or Jurassic Park over Poltergeist, but any step in releasing his stuff in HD is a benefit to us all. Paramount should work on him for a super HD set for Indiana Jones once 4 comes out next year.
Sony did at least manage to strong-arm him with Close Encounters... although the 50$ price tag is nauseating for a catalog release (40$ for the DVD is bad enough, too). Who knows if he doesn't make them pull that as well...