Board Thread:Questions and Answers/@comment-217.55.64.90-20150327010210/@comment-69.76.232.197-20150406002816

There is speculation that Thanos is actually controlling or manipulating Strucker's actions through the Chitauri Scepter while it is in HYDRA's care, so if he does appear in the film and that speculation proves true. it will probably be more of a presence than an actual physical appearance.