We were there yesterday. Karibuni is still in the process of construction/renovating, saw the barge bring over furniture and overheard a woman on the beach say she had emailed them and was told they would reopen on Oct. 26th. Disappointing for us because we go home on the 23rd.
I will add that we had a lovely day at Yellow Beach. Very attentive service, comfy chairs, a yummy lunch and the water is absolutely gorgeous...warm, calm and shallow. At the moment, the better beach is Yellow as there is quite a bit of seaweed in front of Karibuni.
I was surprised at the number of reserved lounges; the entire first row was reserved. We were on the first boat and had to sit in the second row.
Of all the beaches we visited this trip, Pinel was the best.