How will games handle resolution on the 820 and 920(and other similar situations)?

If I am not mistaken, the 820 and 920 have an identical processor, but the 920 has a much higher resolution display. A demanding game running at 30fps at 800x480 would surely tank on the 920 at native resolution(requiring a resolution downscale). Do you think games will be optimized for the flagship phones and scaled down accordingly, or vice versa?