On Doris' Madagascar Wiki page, it says that she will be voiced oleh Calista Flockhart! So far, we also know that there MIGHT (it is not confirmed, but people think it's possible) be a cinta trianlge between Dr. Blowhole, Doris, and Kowalski. We also know that from the "Penguin Who Loved Me" poster that she might not have a Segway.
Also on the wiki, it says that it will be the last Dr. Blowhole special(however, I haven't found that anywhere else, and Wikia's can be modified oleh anyone, so this may not be true.) If anda guys know anything else, plz tell me and/or post/comment!