I just reviewed the available info and sized it up pretty quickly for my tastes and requirements: I got the $0 Focus and it's not going back. Note that the S screen is going up to 4.3" and the Flash down to 3.7". Neither change is attractive to me. I think the already-beautiful SAmoled screen is optimally-sized at 4", especially because I don't want my phone to be any bigger. Also, I have no need for a front-facing camera. If a larger screen size or a FF camera is important to you, you may want to wait. I wonder if the FF camera will make for a thicker phone or one with a bulge. I would guess that the Flash will go for $99 and the S for $199 -or whatever they get for the Titan. Although the Titan is supposed to have a 2.2 lens, and THAT is compelling -I haven't read anything about any change in or the speed of the lenses on the new models. I also haven't read whether the new phones will have expansion slots, and use the same batteries for which we have cheap replacements.
Also, I don't know much about phone cameras, but in digital cameras, higher pixel counts have typically been associated with greater noise (pixelization, etc.) unless they increase the sensor size as well, which is unlikely for phones (although, again, I don't know much about phone-camera technology). The jump from 5 to 8MP is significant, regardless. Then again, megapixel increases do tend to sell cameras in a large sector of the camera market because consumers are sold that more megapixels logically means better pictures.
There will always be better phones for roughly the same contract price; really nice phones for $0 are rarer. Good luck, and regardless, you're going to love your new Super AMOLED screen.