Everyone is talking about how obsessive and stalker-like Donnie is being, but you have to remember they are teens that have been stuck in the sewer! Normal boys that age are still figuring out how to treat girls. The turtles have been stuck in a sewer all of their lives, so that does not help the situation later. Donnie is not a bad guy for being obsessive like, he is just a clueless teen with room to grow just like his other brothers.
Being a big fan of the 2003 series myself, I would love to see more references to that version in the new series! ^_^
The new show is definitely geared towards being more like the ‘87 show, so I don’t think it’s super likely, but I know I’d be excited if something came up! :)