The new family of products come on the same day as a major product announcement by Kobo's chief rival Amazon, including the expected unveiling of the next generation of the Kindle Fire tablet.
Billed under the slogan an "eReader for everyone", the new Kobo range starts at the budget price of £59.99 for the Kobo Mini, significantly undercutting Amazon's cheapest Kindle.
Available on October 1, the 5-inch device is claimed to be the smallest and lightest eReader available in the world that features the e-ink technology for reading in bright sunlight.
The Kobo Mini comes in black or white and a selection of three Kobo SnapBacks in Teal, Ruby Red and Purple. Aimed at "young adults", the device costs just £59.99 and can hold up to 1,000 eBooks.
At the top of the new range is the Kobo Arc, a 7-inch WiFi tablet that runs Android Ice Cream Sandwich overlaid with Kobo's own Tapestries user interface, offering "new ways to discover content".
Tapestries features a learning engine that responds to content that the user has "pinned" and then recommends related material.
Alongside eBooks, users are able to browse web pages and access movies, TV shows, and music on the device via the Google Play store. Pre-loaded apps include Facebook, Twitter, Rdio, Zinio and PressReader.
The Arc comes with a 7-inch high definition display, front-facing speakers with SRS TruMedia, a built-in microphone and high-resolution 1.3 MP camera to take photos and videos.
Available in black or white with blue or purple SnapBacks, the Kobo Arc will be available in November priced at £159.99 for the 8G model and £189.99 for the 16G. It will compete with Google's Nexus 7 tablet, but also the new Kindle Fire device expected from Amazon later today.
Other products in Kobo range include the Kobo Glo, a front-lit e-ink eReader with a 6-inch screen that features ComfortLight technology, enabling users to read more easily at night.
The WiFi tablet comes in black or white with a choice of SnapBacks (pink, sunset, blue moon and silver star) and will be available on October 1, priced at £99.99.
The Kobo Touch, a touchscreen e-Reader, has also been reduced down to £79.99 and fitted with Kobo's latest software to offer greater personalisation options. As with all Kobo eReaders, the device gives access to the Kobo Store offering 3m eBooks, including many free titles.
But as well as Amazon's Kindle, the eReaders will also soon have to contend with the forthcoming launch of Barnes & Noble's Nook devices in the UK market.
Founded in 2009, Kobo claims to have more than 10 million customers across 190 countries. Alongside hardware devices, the company also offers mobile apps on tablets and smartphones.
"Our focus has remained firmly on delivering a superior experience for booklovers around the world," said Michael Serbinis, the chief executive of Kobo.
"With 11,000 booksellers and leading retail partners across five continents, we are bringing the new Kobo Family to booklovers everywhere.
"The new Kobo Family provides more choice for booklovers and a superior eReading and content discovery experience - truly, an eReader for Everyone."
Hiroshi Mikitani, the chief executive of Japanese eCommerce giant Rakuten, which bought a majority stake in Kobo in January, added: "The launch of Kobo's new Family of eReading devices represents a bold step for both Kobo and Rakuten.
"This reinforces our commitment to expanding digital goods and e-commerce services to new markets around the globe through beautiful and exciting devices."
The Kobo Glo is available to pre-order now at WHSmith.co.uk. When all the new Kobo products launch, they will be available to buy at WHSmith, Dixons, Argos, John Lewis, Play.com and Asda.