“HTC has canceled its larger, 12-inch Windows RT tablet over concerns that overall demand for large-format tablets has been weak and that the cost to build such a device would have made its sticker price too expensive for today’s market.”
see HTC drops 12-inch Windows RT tablet, sticks to a 7-incher
A 7 inch tablet with that other OS still won’t match the price/performance of */Linux on ARM. To compete, you have to sell Android/Linux or GNU/Linux on your products. Check out ASUS… They even sell gadgets with keyboards running Android/Linux.