The first thing I saw was this cover at a distance, which scared me a bit. I was thinking "they didn't do a Bluperman Retroactive from the 90s, did they?" Then I moved in closer and saw it was the Superman from the Batman Beyond-verse, done by the creative team involved with May Parker Spider-Girl (which was some of the best Spidey comics of the past 10-15 years). Cool!
Overall, it's a good story, worth checking out. You don't need to be well-versed in Batman Beyond to be entertained -- just think of it as an Elseworlds. I loved the little scene with Jimmy Olsen's signal-watch ring-tone, and the ending banter with Batman. Schway.