The answer is partially yes,because of new unit replacements,improvements and power distrubition, but on the other hand, the general tactical approach will not be changed.If you are for example a toss the importance of Zealot production will protect itself at least at the beginning of the game because of high strength difference between the first units of the Zerg and Terran.Also Terran ‘medieval ages’ will be strong enough to dominate other races by the usage of the new Terran Tanks this phenomenon could also be true for the Zerg players aided by Lurkers and Hydras.The advanced ages will be more complex to predict which race has more advantages than the others, the easiest way to determine this problem can be solved by just playing the game!!