The results you see will depend on the quality of the crush of the grain. For most people and the crush they use, this will not be a big deal as it takes quite a while for the starches to gelatinize and if the temperature is brought down to the intended temperature before the majority of the starches gelatinize you will simply end up with a slightly more dextrinous wort and a higher FG. As the crush gets smaller the gelatinization speeds up and saccrification happens much quicker so more dextrines are produced. The only way to tell what your beer will turn out to be is to complete the mash, make beer, then sample it.