Jamie Ryan, a former Apple employee, says the company has been working on a full-size iPad with a Microsoft Surface-like touch keyboard cover. Zach Epstein has more details:
Ryan claims to have learned of Apple’s plans from multiple unnamed Apple employees, though he is not confident that the new cover will be ready for an unveiling this week. He says Apple has been testing various designs for a keyboard cover for quite some time now, and he also notes that other iPad cover accessories may be in the works.
I use the Logitech Ultrathin keyboard cover for my iPad 4. It works great but could be thinner. The similar keyboard for the iPad mini is simply too small to use.