Yes, there now exist giant (55 to 84 inch diagonal) Android Tablets! These 'Interactive Panels' come with an on-board Android processor.

Many of these ITPs also come with software for your desktop computer, so you can still do your IWB authoring - using the ITP as your drawing surface. In addition, one can switch over to 'Android Mode' and use the pre-installed Apps (or, in some cases, download apps from a supported Store).

Disclaimer: I do provide training on some of the ITPs (although not on Android Apps directly!)