The script has more of an action/adventure tone to it. The only similarities between "Batman 2" and Batman Returns are Penguin & Catwoman as villains, the Christmas setting, and Batman is framed for murder. I think he also turns his cape into a glider a couple times.
The plot was basically about Penguin and Catwoman killing Gotham's elite citizens--the Five Familys--which includes Bruce Wayne, and Batman is being framed for the murders. From each millionaire, a raven statuette is stolen. Long story short: a dark secret about the families' wealth is revealed to Bruce and the combined ravens form a maps showing where the stolen gold and silver bullion is. The real highlight of the script to me is the finale which takes place in Wayne manor and the Batcave!
There is also a subplot about the poor living in the park. Dick Grayson is introduced as a homeless kid who is a vigilante of sorts in the park that Batman meets. Bruce eventually takes him in. While Dick has a Robin costume, I don't believe he wears it any and is only referred to as "Dick" in the script.
The script reads like a more traditional sequel than Batman Returns. Vicki Vale is still present throughout, and the opening has scrap parts of the Batwing being sold. The storyline isn't bad and is actually pretty tight but it seems like an odd story to use as a second film in my opinion. I think it would've been interesting if the movie would have been as controversial as Batman Returns was. While it's not as bizarre or grotesque as Returns it does have a lot of R-rated violence and an S&M sequence involving Catwoman. Of course those things could have been toned down in rewrites and with filming. It is clear why Burton would not want to do it. The script doesn't match his sensibilities at all, but I could see other directors using this script if Burton chose not to return.
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