It will increase the ability of the disease to evolve to higher transmissibility by in effect combining what were disparate locations into one large gene pool. (not entirely new: bats travel so there was some degree of interconnection but now it will be much higher and faster)
The larger this thing grows and the longer it lasts, the more it will accelerate. The first world needs to put MAXIMUM effort into this NOW or it will deeply regret it's delay.
The precursor of HIV had been around for a very long time and almost certainly occasionally infected a human here and there. But if always burned out before because it could not transmit well enough to get a large enough population to start adapting to humans. Then they got cities with much higher population densities and (the key element) was medical services trying to apply Western style medicine without the basic tools. They could not afford single use needles so they used every needle numerous times but also could not afford proper sterilization equipment. So they created the perfect environment for HIV to adapt to humans and it took full advantage of the opportunity. MUCH THE SAME COULD WELL HAPPEN WITH EBOLA.
The only lesson we really learn from history is that we never learn from history!