Here are my speculations - I believe Dragon will do another version of the the Panzer II, either an upgraded version of the tank or the same variant painted in a different scheme (and I think the second possibility more likely). I believe that if Dragon does another tank it will either be a Marder II, allowing them to use the same lower hull, wheels and track, or we will see a T-38. I don't believe either of these will come out as a model kit.
What I would like to see Dragon do - I would like to see an Sd.kfz 222 armored car or a Protze. I don't think either of these are actually an unreasonable speculation either as Dragon loves to copy things that people have already done. I don't know why they do that, but they have done it over and over again.
Well, those are my thoughts, what do you think?