@Hates Idiots: Those are all old and non-authoritative sources. There have been other options proposed and debated, but saying that there has been a design change or that "there will not be a downtown LA terminal for the HSR" is false, as far as I can see.
The official route maps from the California High-Speed Rail Authority clearly show that the current plan is to connect to the LA Union Station.
http://www.cahighspeedrail.ca.gov/Palmdale_-_Los_Angeles.aspxhttp://www.cahighspeedrail.ca.gov/los_angeles_anaheim.aspx