Hello from JustAnswer.
The answer can only be based upon the current level of knowledge. At this point, all of the types and strains of HIV have been identified, but it is impossible to know whether new strains will ever develop. One year before the first case of AIDS, no one could have predicted that the first type was about to occur. Similarly, one year before the first case of HIV type 2, no one could have predicted the new type.
It is clear, though, that there is no current infections that are a mystery regarding which type of HIV is present. So, even if a new strain is discovered in a few years that has the same transmission pattern, but you also have not engaged in any risky behavior, there would be no reason to be tested for the new type of HIV.
In addition, if a new strain does occur and the testing evolves to incorporate that new strain, this will be disseminated as information to doctors and public health officials, so that patients will know if and when testing would be recommended because of a new strain.
It is important to note that it is currently recommended that everyone be regularly tested for HIV, although someone that is confidant that they are in a mutually monogamous relationship (or not having any sex) may choose to opt out. Sadly, infidelity is fairly common, so the current recommendation says that while the individual can make that determination, the doctor should not assume it and should offer testing to everyone.