You know when my estimated date is, but the where is an interesting one. To my surprise I today discovered that KZN has surpassed Gauteng and the Western Cape in the past year - more new caches have been published there than in any other province, even including all the additional Gauteng Power Series caches and other pseudo-power series.
Sorry for the late comment
Many of the KZN caches placed recently are also "Power Trail" caches. In particular, see the ZR, BR, SR, TMR, PGR and SRR series of caches. There are 141 caches in these series.