Olympus may be preparing to announce a new flagship DSLR, the E-5, at the Photokina expo next month in Germany. The camera will reportedly retain the 12-megapixel sensor of the current E-3, along with the 4/3 lens mount, an unnamed source has told 4/3 Rumors. Olympus reportedly designed the E-5 to compete directly with Nikon's D300s and Canon's 7D.