Have you seen the DDXP blog?
"Will there be options books coming out for the Essentials classes? “Players Option: Heroes of Shadow should make your Hexblade very happy”. They want books now to be “something for everybody”.With CB being web-based, they have info about who is playing what. They know what most popular classes are now. They can prioritize things to support things people play most. Talking about ability to change unpopular classes if they figure out WHY people don’t play them.
Most popular races: Human, Dwarf, Elf, and Eladrin.
Most popular class: Fighter
Least: Runepriest."
So... seems like we'll get even more stuff for Fighters, Rogues, Rangers, etc that already have tons of options (which is likely why people play them, more customization = more fun IMO)