Yeah this is a return to form riffing old B-movies. Rifftrax has the luxury of never having to pay licensing fees since their main product is an external audio track to be played over films you provide yourself. MST3K has always had to pay licensing fees unless whatever they want to poke fun at is in the public domain.
The live stream countdown for the campaign was a huge success. They raised enough to do 13 episodes and a Christmas Special.