Once the two services are merged, Spark customers who currently belong to Lightbox will be presented with some kind of yet-to-be-defined offer for the combined service.
A spokeswoman for Sky said the Neon-Lightbox merger would happen "towards the middle of the year".
Spark first put Lightbox on the block in March 2019, preferring to focus its firepower on sport - which some would see as a sensible decision as the likes of Netflix, Disney+ and Amazon Prime Video globalise entertainment.
Sky announced on December 19 that it was the buyer, for an undisclosed sum.
Sky's $13.95 per month, no-contract Neon streams movies and TV shows, drawing heavily on Sky's HBO rights. Its Lightbox acquisition comes with rights to a number of Hulu original series, including The Handmaid's Tale.
In October, at its full-year result briefing, Sky said it had 161,000 streaming customers across Sky Sport Now and Neon, but did not offer a breakdown.
Chief executive Martin Stewart did say that streaming customers were now rising faster than satellite customers were falling - allowing Sky to eke out a net gain in total subscribers (which rose 1 per cent to 779,000 for the first time in years.
The bad news: streaming subs pay less than those who use decoders, and average revenue per user per month (Arpu) sunk from $77.73 to $74.84 overall, contributing to another fall in revenue and profit.
NZ Rugby takes a bath
Sky shares closed yesterday at 69c, down 64 per cent over the past 12 months and equalling an all-time low also struck last month. The company's market cap is now just a shade over $300m.
Sky's ongoing fall means NZ Rugby's 5 per cent stake - worth just over $20m when the stock was handed over as part of the new Sanzaar deal mid-October - is now worth just over $15m. (Some analysts think Sky is over-sold and see it rebounding. But, for now at least, it's looking like the NZR should have taken more of its payment in cold, hard cash.)
Spark closed at $4.66. The stock is up 16 per cent over the past year, and the telco and budding sports broadcaster now has a market cap of $8.6 billion.