I think you're asking what are you limited to with 2.0b1 vs 2.0?what you can't do doing an emunand with 2.0b1/3.0 clones firmware?
If I understood your question correctly, 2.0 will allow you to load multiple ROMs on a single microSD card, and will have ROM support for NAND-save games, such as Pokemon and Animal Crossing.