Updated March 11th: The Scott catalogue number for this issue is 5156.

Updated January 27th: Here is the digital color postmark for this issue: It measures 2.91″ x 1.39″.

Updated January 18th: From the USPS:

A special ceremony for the Lili’uokalani Gardens Priority Mail stamp will be held Monday, Jan. 23, at 11:00 a.m. at the Shoroan Tea House, Lili’uokalani Gardens in Hilo.

Hilo Postmaster Alton Uyetake, Hawaii County Managing Director Wil Okabe and Friends of the Lili’uokalani Gardens President K.T. Cannon-Eger will participate in the ceremony to unveil an enlargement of the stamp.

While this is not a First-Day-of-Issue ceremony, stamp sales and cancellations will take place.

Also:

On January 22, 2017, in Kansas City, MO, the U.S. Postal Service will issue the $6.65 Lili’uokalani Gardens Priority Mail stamp, in one design, in a pressure-sensitive adhesive (PSA) pane of 4 stamps (Item 119900).

The stamp will go on sale nationwide January 22, 2017.

The U.S. Postal Service issues this Priority Mail stamp to coincide with the 100th anniversary of Lili‘uokalani Gardens in Hilo, Hawaii. Built on land donated by Queen Lili‘uokalani (1838–1917), the last Hawaiian monarch to govern the islands, the gardens were dedicated in 1917 and named in her honor. The stamp art features one of the gardens‘ most iconic structures, the red wooden shelter on a stone bridge spanning a portion of the pond. The bridge is surrounded by three of the gardens’ stone lanterns and lush tropical plants. Art director Greg Breeding designed the stamp with original art by Dan Cosgrove.

Stamp Fulfillment Services will make an automatic push distribution to Post Offices of a quantity to cover approximately 30 days of sales.

How to Order the First-Day-of-Issue Postmark:
Customers have 60 days to obtain the first-day-of-issue postmark by mail. They may purchase new stamps at their local Post Office, at The Postal Store website at http://www.usps.com/shop, or by calling 800-782-6724. They should affix the stamps to envelopes of their choice, address the envelopes (to themselves or others), and place them in a larger envelope addressed to:

FDOI – Lili’uokalani Gardens Stamp
USPS Stamp Fulfillment Services
8300 NE Underground Drive, Suite 300
Kansas City, MO 64144-9900

After applying the first-day-of-issue postmark, the Postal Service will return the envelopes through the mail. There is no charge for the postmark up to a quantity of 50. There is a 5-cent charge for each additional postmark over 50. All orders must be postmarked by March 22, 2017.

There are two philatelic products for this stamp issue:

• 119916 First-Day Cover, $7.09
• 119921 Digital Color Postmark, $7.80

Technical Specifications:

Issue: Lili’uokalani Gardens Stamp
Item Number: 119900
Denomination & Type of Issue: $6.65 Priority Mail Rate
Format: Pane of 4 (1 design)
Series: N/A
Issue Date & City: January 22, 2017, Kansas City, MO 64108
Art Director: Greg Breeding, Charlottesville, VA
Designer: Greg Breeding, Charlottesville, VA
Typographer: Dan Cosgrove, Chicago, IL
Artist: Dan Cosgrove, Chicago, IL
Modeler: Joseph Sheeran
Manufacturing Process: Offset, Microprint
Printer: Ashton Potter (USA) Ltd. (APU)
Printed at: Williamsville, NY
Press Type: Stevens, Vari-Size Security Press
Stamps per Pane: 4
Print Quantity: 12,000,000 stamps
Paper Type: Nonphosphored Type III, Block Tag Applied
Adhesive Type: Pressure-sensitive
Processed at: Ashton Potter (USA) Ltd. (APU)
Colors: Black, Cyan, Magenta, Yellow
Stamp Orientation: Horizontal
Image Area (w x h): 1.42 x 1.085 in/36.07 x 27.56 mm
Overall Size (w x h): 1.56 x 1.225 in/39.62 x 31.12 mm
Full Pane Size (w x h): 4.12 x 3.45 in/104.65 x 87.63 mm
Plate Size: 20 stamps per revolution
Plate Numbers: “P” followed by four (4) digits
Marginal Markings:
Front: Plate number in two corners of pane
Back: ©2016 USPS • USPS Logo • Four barcodes (119900) • Plate Position Diagram • Promotional Text

Updated January 5th: This stamp will be issued Sunday, January 22nd with no ceremony and a Kansas City, MO, postmark.

from the USPS December 28, 2016:

This Priority Mail stamp is being issued to coincide with the 100th anniversary of Lili’uokalani Gardens in Hilo, Hawai’i. Built on land donated by Queen Lili’uokalani (1838–1917), the last Hawaiian monarch to govern the islands, the gardens were dedicated in 1917 and named in her honor. Hilo’s Lili’uokalani Gardens are Japanese in style with influences of Hawaiian remains of lava flows, plantings of tropical trees and flowers, and a view of the Mauna Kea volcano — Hawai’i’s highest point. The stamp art features one of the gardens’ most iconic structures, the red wooden shelter on a stone bridge spanning a portion of the pond. The bridge is surrounded by three stone lanterns and lush tropical plants. Art director Greg Breeding designed the stamp with original art by Dan Cosgrove.