The RSX IS the new integra. Look around the web a little bit, overseas it is still called the Honda Integra. The K-series engines is the next generation of hybrids, everything about them is bigger and beefier. They are still in thier infancy, though, so there are a lot of new hybrids being thought up (K20A2 head on the A3 block, K20A2 head on the new CRV K24 block, etc...)

Honda management just thought that calling it "RSX" in the US would sell more cars, not unlike how the "Legend" was turned into the CL and TL cars.