Hasn't been officially announced yet, according to the tweet, but it does appear on some of the KTO pages. It's on the splash page, the two English pages, the German page, the Russian page, and the Arabic page. Some of the others still have "Korea Sparkling" or have a message in a language I can't read. This Facebook thread shows the decision was down to "Korea, Be Inspired" and "Korea Inspiring." It's tricky to guess where to put the comma, because the logo doesn't have any punctuation. The only other time I've seen it was in this 한국일보 article, and that gave it a comma, though I wonder if it'd be better with a colon or a period. That way you're not telling Korea what to do.
South Korea, where there's a new tourism slogan every six days, announced in July that it was going to discontinue two of its previous slogans, "Korea Sparkling" and "Dynamic Korea," and offered up the alternative "Miraculous Korea." "Miraculous Korea" was unveiled the other day on a website by the Presidential Council on Nation Branding, KoreaBrand.net (review by Chris in South Korea here). George from Ask the Expat says "it's like an Internet version of Arirang."
In July we came up with a pretty good list of slogans for Korea, and I'm disappointed to see they haven't made the cut. I guess we'll have to wait until next week. Here's my favorite, from Stevie Bee:
Korea - The Most Traditional Country Ever
I think you could also go with "Korea - My Manager Told Me To Tell You That You Have To Come." The best one I've come up with was "Korea: So good we decided to make two," but "Korea: No, the other one" would be a smart choice, too.
We're four weeks into the KTO's three-year Visit Korea Year *cough* campaign.