Digimon Xros Wars 3rd Arc (Hunters) is rumored to be ending on March 25th in episode 25. There is no confirmation if this will be like the first part and lead to a 4th arc soon (arc 1 like 30 eps and then ended and a month later the second arc started.) However, there are strong Rumors that in the April issue of V-jump magazine, a Digimon Xros wars movie scheduled for June will be confirmed, and that movie WILL have the old protagonists involved. The titles of the last 3 Hunters episodes are:
77. Tokyo destroyed? The five digimon hunters
78. Protect everyone. Gumdramon, Roar!
79.Tagiru's Power. This is Digimon Hunter!
I'm guessing that the old leaders will make their first appearance in episode 77.
I don't know why I bother to post this since everyone hates Digimon after season 4 but I just wanted to share
I always cry when I watch it. When Palmon falls and then Mimi's hat flies and the legendary "butterfly" sounds 
So excited
Look at the part where the boat is shown in long distance, they're all the old leaders with their digimons. From left to right : Masaru and Agumon (Digimon Savers/Data Squad), Takuya (Digimon Frontier), Takato and Guilmon (Digimon Tamers), Daisuke/Davis and Veemon (Digimon Adventure 02) and Taichi with Agumon (Adventure 01). I hope we get too see the evolutions the way they were in the old seasons 
