The NASA Spaceflight article Rocket Lab’s Electron rocket set for inaugural flight from New Zealand mentions the upcoming opening of a 10 day launch window:
Rocket Lab, a U.S.-based launch service provider with a New Zealand subsidiary, will become the newest entrant into the world’s launch market with the maiden voyage of its Electron rocket.
The 10-day launch window for Electron’s maiden flight opens at 09:00 NZDT (New Zealand Daylight Time) on Monday, 22 May.
The time offset for New Zealand is UTC+12, placing the opening of the launch window at 21:00 UTC on Sunday, 21 May (which is 17:00 EDT on the eastern seaboard of the United States on Sunday afternoon).
Overall, Rocket Lab’s mission is to offer “lightweight, cost-effective commercial rocket launch services” to the small satellite market.
I noticed that each of the eight engines in the outer ring seems to have two large cylinders attached at the bottom ends to the bottom of the combustion chambers, and the tops to the rocket frame. Initially I'd hoped I'd finally sighted shock absorbers - they look like compressed-gas cylinders, but considering how they are mounted that's not really likely.
Since they are mounted at roughly right angles with respect to each engine's axis, I wonder if they could be vectoring actuators, but wouldn't these large cylinders be an unusual method for vectoring engines?
One interesting point about the Electron - since the fuel and oxidizer pumps are 50 hp electric motors, there is plenty of electric power available - according to Wikipedia the Lithium battery can provide up to 1 MW of electric power.
above x2: Illustrations of the nine Rutherford engines on Rocket Lab's Electron rocket. From here.