The likely class distribution so far:
http://www.gamesas.com/topic/1451136-poll-what-class-will-you-be/
Personal opinion:
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The Night Blade is the most utilized class of the lot at present, so I'd look at splitting that out. The skills types of the archers / assassins may be similar in cases so the approach I would go for is...
1. (RETAIN) Night Blade.
Keep this similar to it's present appearance. Cater primarily for Bow / Dagger ambush builds.
2. (NEW) Night Warden (whatever you want to call it)
This build is also a stealth focused build, but with trees focusing on:
* Deception (Illusion magic add flavor with darkness / alteration / physical)
* Remedy (Healing - non melee focus - chain effects / distance based.)
* Vigilance (Swords / Detection / some traps. The balanced anti-rogue build)