^Yes!
On January 17 and 18 of 2008, Idoling!!! featured a segment called Idoling!!! 2013. This was back during the 1st gen days. In this segment, the members presented their ideas on what their daily schedules would look like 5 years in the future. Masuno also presented his ideas of the Idoling!!! members' futures, but in picture form. Of course, his ideas were complete jokes, but they had a lot of fun with the segment and even got T-shirts with their 2013 characters.
At the end of the January 18th episode, Masuno came up with the idea to have everyone come back to the Fuji TV sphere exactly 5 years from that day, just for one more live broadcast to see exactly how the 9 Idoling!!! members have changed. All of the Idoling!!! members liked the idea and agreed to return on that day, even if they leave show business. Producer Kadosawa was also intrigued by the idea and said that they would somehow do it, even though it's difficult to plan a TV broadcast 5 years ahead of time.
Now, I have no idea if they're really going to go through with that. But, being a big 1st gen fan, I thought that it was an important date to keep in mind. So, I added the countdown clock to remind Idoling!!! fans of the possible reunion of the 1st gen members at the Fuji TV sphere.