Tumblr.ise works in wordpress 3.41
I have just put a test post to my WordPress.org account and it works posting to Tumblr.
I have added a plugin called Tumblrise to my wordpress installation and set it up adn it now automatically adds the blog post that I place on wordpress.org on Tumblr.
My tumblr page is http://michael-wayne-plant.tumblr.com and it will feature my posts form this blog and my www.mwplant.com blog site