There’s a new tablet going through the FCC with the model name TF500T. Considering it ends with T (maybe Tegra), and being right in the middle of two existing tablets (TF300T and TF700T), logic should dictate that this will be the mid range Android tablet to replace the Transformer Prime. But logic doesn’t always work.
Android Police reached out to both NVIDIA and ASUS, and neither of them know what it is. ASUS even responded “First I have heard of it, especially since the next tablets up on the roadmap are Windows based.” It’d make little sense to launch a Windows tablet with the same model number as your Android tablets.