Acura's decision seems to run counter to some competitors such as BMW that are introducing new hybrid systems paired with even more powerful V8 engines. American Honda has not been specific about how it plans to meet the new regulations, but with plans to introduce diesel engines in the U.S. market also shelved, hybrid seems the likely path. Honda has acknowledged developing a next-generation hybrid system which will be applicable to larger vehicles. Weight reductions and technologies like direct injection and more turbocharging will likely play a part as well.
[Source: Automotive News - Sub. req'd]