Here's a good example of what the standard Android tablet will look like in Spring 2012:
Acer Iconia Tab A200
1.2 GHz nVidia Tegra 2 dual core processor
1 GB RAM, 16 GB flash memory
1280x800 pixels, 10.1 inch color touchscreen
WiFi only, no 3G or 4G option
Several manufacturers will produce machines with faster quad core processors, but I think people will find that the apps available don't take advantage of 4 cores very efficiently. The result will be that most people won't see much benefit to the more expensive quad core designs. This will change in time as the price of the quad core chips comes down and app developers learn how to take advantage of the new technology.