Well, I just got done watching it. Pretty good stuff, I urge everyone to purchase it, if possible, so they can keep producing these. Here's my small, no-spoiler review.
First segment, starring Lochley: This is the episode that features the man we saw in the teaser with glowing eyes. It introduces two new characters, including him. Lochley is the only character, apart from a few extras, which may have been CGI anyway. Both new actors were great, particularly the glowing-eyes man. Also, we get to see a new hyperspace gate effect which is just superb.
Second segment, starring Sheridan and Galen: A new Centauri character is introduced, with decent acting, and a good accent. Not as good as Londo's, of course, but quite nice. Aside from him, and a few scenes with Lochley, this episode is mainly Sheridan and Galen. We also get a few seconds of footage inside the Starfury's cockpit, which is quite nice. The battle scene seen in the teaser is in this part, and sadly, had nothing added to it. The Warlock beams are still white as well.

Overall, I was pleased with Lost Tales. The visual effects are amazing and the acting is good. It's nice to have some fresh B5 material, and I hope to see more of these! Oh, one last thing. They added a voiceover of G'Kar at the beginning. Very nice that the commemorated Andreas like that.
