Samsung’s Galaxy S4 was always going to be a big seller — probably the best-selling Android smartphone of 2013 — but the Korean company has lost $12 billion in market value due to concerns that the two Galaxy S4 variants that were recently announced will have a detrimental affect on its profit margins.

Brokers are also concerned that the growth prospects for Samsung smartphone business have “dimmed” following rumors of a new iPhone trade-in program from Apple.

Another day, another new Samsung smartphone. This time it’s the much-anticipated Galaxy S4 Active, a ruggedized, waterproof version of the flagship Galaxy S4 that promises to be “the perfect companion for exploration, activity and adventure.”

Samsung may have already launched its flagship Galaxy S4 worldwide, but it clearly has more treats up its sleeve. The Korean company has begun issuing invitations for a June 20 “Premiere” event in London, where it will announce new products under the Galaxy and Ativ brands.

Back in April, we heard Samsung was planning a “ruggedized” version of its new Galaxy S4 that would be both dust and water resistant, and considerably stronger than the original. Now that device, called the Galaxy S4 Active, has been leaked ahead of its official release.