Ultimate Prestige. Familiarise yourself with what BC2 has to offer in this guide..
A site presumably by DICE or EA has been made. I'm not sure how recently this was set up but it's still a good starter guide to knowing the ins and outs of BFBC2.
Check out the link - You need to have pre-ordered to access it as it requests an EA registered email address with a BC2 soldier attached to it.
Also anyone looking to find a community heavily into Battlefield modding with some very knowledgeable people there. Check out BF Editor in google. (Modding materials, textures, extracting images from the .fbrb file format etc. Not a hacking community.) The real progression into modding will start with the official release as the demo has data scattered all over the place in the folders.