Although an increase in rate will slightly decrease the affordability of homes and reduce the potential cash flow of levered investment properties it will be positive for the overall economy and especially the banks. If the banks can earn a greater spread on their assets they will be able to loosen their lending standards which would be positive for home prices.
There is no talk of rates rising buy 1% in the short term but .25% is highly likely. This increase of .25% on the short term rates will likely push up mortgage rates but it doesn't necessarily mean mortgage rates will be .25% higher the next day. Most mortgage rates are more heavily influenced by their own market forces rather than the Federal Funds Rate. Generally a good indication of mortgage rates is the 10 Year Treasury rate. Most of the time when stocks go down cash flees into Treasuries diving bond prices up and yields down. That's why its usually a good time to lock a mortgage rate in when stock are selling off.
At the end of the day the anticipated .25% rise in the Fed Funds Rate probably wont be detrimental to real estate but a 1% hike probably would be.