The virus is indeed mutating, but the good news about COVID too is that it's mutating far less than influenza, for example. The rate of mutation is pretty low. That does not mean there will not be consequences, because you need only one mutation to have a consequence.
For now, in terms of the mutations that have been identified, we don't know what the consequences are. We know there are two major strains. One is a mutation that started in Europe. The other is the original strain coming from China. It could impact the transmissibility. It could impact the effectiveness of a vaccine, if we develop it, but there is no way to predict that in advance. It's a possibility. It's low, but it's there.