Tablet Controllers!!!!

Hey there I have Kishi for my IPhone and it works fantastic love it, just wondering if there are any talks about a side mounted controller such as the Kishi in the works for iPad / Android tablets?? I have a gamevice I’ve been ripping on my iPad does the trick but it is very big and bulky and something the size of the Kishi just long enough to fit around a tablet to rip around the house or on trips would be unreal, thanks.