If we go with the general idea that security/sneak, acrobatics/athletics and merchantile/Speechcraft have been merged, we stealth characters only have 3-4 skills to use, those being stealth, weapon(s) of choice and acro/athletics. Now this honestly worries me. I don't want a character based solely on 3 skills, I believe it seems to thin and weak foundation and honestly not a lot of room for leveling ect. Seeing as mages still have all magic schools (except for one) and the returning enchantment, and warrior types have armorer, weapon(s) of choice, armor skill, acro/athletics and block skill it seems we're sorta missing out :S.
Maybe it's just me, but I'd love someone to put my mind at ease.