I'll give you my thoughts.
The 13" MBA will most likely not have a quad-core. It will draw too much power and detract from one of the main selling points of the Air, which is the superb all-day battery life, since the quad-cores will only be released down to 35W.
The 13" MBP, however, will have a much higher chance of getting the quad-cores, whether it be normal 35W or the higher voltage 45W used in 15"+ today. Most likely it will be the 35W, and as long as the thermal requirements are met, the 13" will have a quad-core.
What I think is that you will either have to decide between a dedicated GPU and a quad-core for the 13". Apple could be able to squeeze a GPU into the 13", but that would cause the laptop to be too hot for a quad-core. Conversely, a quad-core would be too hot for a GPU. So either a dual-core with a dedicated GPU, or quad-core with Intel graphics.
If Apple DOES redesign the MBP to be thinner, then there's practically no way either dedicated GPU or quad-core will be on them. It'll simply be too hot.
My predictions are that Apple will not redesign the MBP line, and give an option for 13" users to remove the ODD for a GPU or keep the ODD for quad-core CPU. The 15" and 17" will retain both the ODD and current design, but will have both the quad-core and dedicated GPU.
There will be no 15" MBA, because that would defeat the purpose of a 15" laptop. The 13" MBA will not have a quad-core due to power requirements.