Sorry to inform you but till now there is no such updates from Nissan for automatic Transmission (AT) Version of Nissan Micra. However, you may go for Maruti A Star or Hyundai i10 which are of the same segment.
Maruti has recently launched the automatic version of A-Star which is powered by the company's well known fuel efficient 1.0L, 998cc, KB Series petrol engine. For detailed information about this automatic variant you may visit the below given link
Maruti A-Star AT VXI
Another option is Hyundai i10, its four variant comes with automatic transmission gearbox. All of these four variants are powered by the 1.2L, 1197cc, Kappa engine. You may visit the below given link for detailed information about these variants.
Hyundai i10 Magna AT
Hyundai i10 Sportz AT
Hyundai i10 Asta AT
Hyundai i10 Asta w/Sun Roof
For comparison between these four variants you may visit the below given compare link.
Compare Hyundai i10 Models
To compare automatic variants of Maruti A Star and Hyundai i10 you may go through above given link.
Compare Maruti A Star and Hyundai i10