I guess it's nice for people afraid of planes. Otherwise i don't see what the point is.
Well, high speed rail competes well with short haul flights. That's what it's great for, and it complements the transportation system by introducing a high capacity alternative for trips that are a bit too long to drive and too short to fly. It's suited for trips that are 150 - 900km long and when introduced it has usually taken the majority of the market share between cities that fall within that (Tokyo-Nagoya, Barcelona-Madrid, Paris-Brussels, Cologne-Frankfurt) practically eliminating air traffic between the cities, easing congestion at airports and freeing more space for long-haul travel.
This approved line however doesn't fit in that scheme however, it's just too long. People won't travel from Moscow to Beijing using the train most probably and it mostly serves communities between the cities like the trans-siberian railway does today. However I suspect we're talking about multi-purpose line, which allows high speed rail travel. Unlike the Japanese and French for example in Germany freight trains are allowed in high-speed lines if they meet certain requirements so we're not talking about long and lumbering freight trains going 80km/h here. And this is the idea here, it will have high speed link, but the main focus is to have a good quality and fast rail freight link.
The idea has been brewing for a while. The idea behind it that it serves a certain niche in the markets between shipping and air freight - cargo that needs to get somewhere faster than with a ship (or to a place a ship can't go) and is too big/expensive to haul by air. We're talking about medium sized and medium priced cargo on a high capacity system. That's what the point is.
Journalists just tend to see the high speed passenger rail part because for the public the point is how fast can they go.