Back when IKAROS was in the news I saw a reference to a follow on mission -http://global.jaxa.jp/activity/pr/brochure/files/sat28.pdf
The second mission will take place in the late 2010s. It will involve a large-sized solar power sail with a diameter of 50m, and will have integrated ion-propulsion engines. The destinations of the spacecraft will be Jupiter and the Trojan asteroids"
Is this still planned? Has anyone heard anything new in the last 3-4 years?