For clarity's sake, the concept of a missing link is unscientific since 'chains' do not metaphorically illustrate the scientifically determined theorem of evolution. If you want to find an intermediate genus between man and ape there are a half a dozen or so species of the hominin called Australopithecus found in the Rift Valley of Tanzania and down south-westwards down to the Transvaal in South Africa. They walked walked upright, had human like teeth but were able to climb trees easily. At the same time more human-like hominins of the genus Homo lived alongside them.
The new find H. naledi, does look like an early Homo erectus species which might date it around 1.5 to 2 million years before present but a lot more post-excavation research will be needed to bring to light all the evidence.
For the record, whereas due to great advances in medicine we are now taller and healthier than we were a hundred years ago, if we were to travel back in time half a milllion years in Europe including southern England, the species of human H. heidleburgensis were taller still than we are now and extremely robustly built. (I visited the primary UK archaeological site during excavations at Boxtree).