Apple announced TD-LTE models of the iPad Air and iPad mini with Retina display are available in China, starting today. Although there were already existing iPad Air and iPad mini Wi-Fi + Cellular models, these are the first new iPad models sold in China to support higher speeds. Prices for the TD-LTE iPad Air range from 4,488 RMB ($723) for 16GB, to 6,588 RMB ($1062) for 128 GB. TD-LTE iPad mini with Retina display prices range from 3,788 ($610)…