And I am personally of the belief that we do not know all there is to uncover about the mysteries of evolution as a whole. I think we're likely to find that, while mutations themselves are more or less random, the EXPRESSION of genes may be much more flexible than we previously thought. IOW, there may be a bit more to evolution than simply "the fittest survive to procreate".
I think we'll find out that environmental factors can impact gene expression, potentially even from one generation to the next. I think all creatures have 'dormant' features in their genome that can shift towards expression or non-expression based on what happens during the lives of the individuals. Now, I know this has been thought of as "fringe" in the past, but my bet is that it will be discovered to be not only possible, but possibly even common.
Just to give a very simple example, and I am NOT suggesting I'm "right" about this particular one thing, but this is to illustrate the general concept. A species begins to run out of resources (food, water, and productive territory) due to population overshoot. So the % of individuals who end up being asexual, or homosexual, begins to increase. The 'gene' for the behavior is already there, maybe from 10 million years and 10 species prior, but conditions/environment stress can trigger a shift in the expression of the gene, long down the evolutionary chain from when it first evolved.
Just my pet personal theory, this may be incorrect of course 
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