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Regarding the Hit and Expertise Caps
In the context of stats, the term "cap" refers to the point at which equipping more of a particular stat will have no additional value. For hit rating and expertise rating in particular, the cap usually discussed is for the effect of these stats on raid bosses. For example, once you reach or surpass the hit cap, you will never miss an attack against a raid boss unless you are under the effect of some debuff that reduces your hit chance (for example, Attumen the Huntsman's curse). There is no "minimum" chance to miss melee attacks, nor to be dodged or parried.
Your base chance to miss a raid boss while dual wielding is 28% with auto-attack on both hands. Your base chance to miss a special attack is 9%. For each 15.77 hit rating you equip, you reduce your chance to miss by 1%. Thus we can calculate hit caps for auto-attack and special attacks:
Auto-attack, 0/5 Precision: 442
Auto-attack, 5/5 Precision: 363
Special, 0/5 Precision: 142
Special, 5/5 Precision: 64
Your base chance to be dodged by a raid boss with any attack is thought to be 6.5%. For each 3.94 expertise rating you equip, you gain 1 expertise, reducing your chance to be dodged by 0.25% (thus it takes exactly 15.77 expertise rating to reduce your chance to be dodged by 1%). Thus, we can calculate expertise caps for various combinations of talents and racial abilities:
0/2 Weapon Expertise, non-Human: 103
1/2 Weapon Expertise, non-Human: 83
2/2 Weapon Expertise, non-Human: 64
0/2 Weapon Expertise, Human (wielding swords or maces): 83
1/2 Weapon Expertise, Human: 64
2/2 Weapon Expertise, Human: 44
The hit and expertise caps are NOT magic numbers that every rogue [or any rogue] must reach. There is no special benefit to being capped with either stat. The purpose of listing the caps here is so that you do not accidentally overshoot either cap by equipping too much hit rating or expertise rating. Always remember that any hit rating or expertise rating beyond the cap will have zero positive effect on your DPS.
