I've come across a portion of dialog, which has some grammar that I have not seen before. Focusing on the portion in bold, what is the purpose of て form plus てね? What does てね mean and is it a shortened version of something?
待っててねー！！ キミのこと すぐに見つけるからーーー！！！
My translation: Wait!! Pal, because I'm coming to find you right now!!!