The Necklace of Serenity
The wearer gains a +4 bonus to his effective level when determining the size of his ki pool and the level-based effects of his ki pool ability (such as bypassing damage reduction).
Ki Pool- (important part)
By spending 1 point from his ki pool, a monk can make one additional attack at his highest attack bonus when making a flurry of blows attack. In addition, he can spend 1 point to increase his speed by 20 feet for 1 round. Finally, a monk can spend 1 point from his ki pool to give himself a +4 dodge bonus to AC for 1 round. Each of these powers is activated as a swift action. A monk gains additional powers that consume points from his ki pool as he gains levels.
Does this mean that a monk would get ki powers early? For example would an 8th level monk wearing the necklace be able to use abundant step as it uses ki from the pool?
No. The level-based effects of his ki pool ability are only those listed under 'Ki Pool'. Requiring Ki expenditure to activate does not make it a 'ki pool ability'.
Sounds reasonable, boy do I wish it gave powers earlier.