I'm not sure this will happen to be honest. Four strokes are inherently more complicated and thus expensive and heavy. With the power required for a rally cross buggy the revs will need to be quite high for a four stroke and this generally means that pushrods are out of the question, and an overhead cam and drive will be hard to develop and expensive.
Also you have to think of the lubrication, I can't see splash feed from a sump working as every time you crash the cylinder could fill with oil. The only way round it that I can see is sealed pre lubricated roller bearings for the crankshaft and con rod, but this would mean that the con rod would be much larger and heavier which would restrict engine speed again and you would still need to lubricate the piston/liner.
Maybe ROAR know something we don't but if this does happen I will expect the engines to be expensive to buy and maintain.
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