Logitech's gaming series, or Logitech G, only has one keyboard available that features RGB lighting. However, that keyboard, the G910 Orion Spark, is about to have a little brother. It's called the G410 Atlas Spectrum, and it has RGB lighting. However, unlike the rest of the mechanical keyboards offered in the G series, it's tenkeyless.
The tenkeyless design makes the keyboard smaller and portable so that you can take it to a friendly LAN match or a professional eSports tournament. This will be the second keyboard in the lineup to have RGB lighting, the new wave of bells and whistles on peripherals. Razer is dropping its Chroma RGB lighting on nearly all of its peripherals, so it's likely only a matter of time before Logitech does the same to its gaming series.
As usual, the mechanical keyboard will have Romer-G switches as well as a dock at the front of the keyboard for Arx Control, an app for iOS and Android mobile devices that can display information about your computer, in-game information for support titles, and a hub to control various Logitech G peripherals.
If the G910 at $179.99 is out of your price range, then the G410 might be a better option at $129.99 when it comes out in October. This puts the keyboard in direct contention with Logitech's own G710 and G710 Plus, which have dedicated macro keys and dual-zone backlighting. More importantly, the G710 and G710 Plus have Cherry MX Blue and Brown switches, respectively. This could be a way to not only bring more RGB keyboards to Logitech's lineup, but also phase out the Cherry MX switches in favor of the company's own Romer-G switches.
Update, 9/29/2015, 7 pm PDT: Logitech provided a higher-quality image of the G410 keyboard.