KLRT-DT has been HD capable since day one. They can do 480i, 480p, 720p & 1080i. They are currently upconverting everything to 1080i, but may change to 720p when FOX-HD starts. ClearChannel owned KLRT-DT (fox) & KASN-DT (UPN) are the only stations in LR currently broadcasting at full power levels.
WB station KWBF-DT
should be on the air by spring '04.
DirecTV is adding CBS-HD for people in O&O markets and in "white area" markets. This will be done by super bowl, but it will not affect viewers in the LR/PB DMA, since KTHV is not a CBS O&O station. DirecTV is also adding fox widescreen very soon, but it will not be available in LR either.
AFAIK, DirecTV's HD capacity will be max'd out when they add the above channels, until they launch another satellite sometime this quarter. If that sat launch is successful, it will also allow D* to add the LR local analog stations to their channel lineup.