As of today, new accounts for Karos are disabled, and current players will be unable to purchase in-game currency for the cash shop. Karos Online will spend its next week spinning down its wheels before turning off the lights on April 13th.
Happily, Ignited Games has created a generous welcome package for Karos players willing to make the jump to Rosh Online. The benefits for doing so include in-game goodies and the conversion of cash shop currency to a compatible equivalent. On top of that, Karos players can jump into higher-level Rosh characters depending on how high they leveled their Karos contemporaries.
[Thanks for the tip, Jeff!]