Invasion of Marijoa, its clear that they will raid there and destroy the Red Line.
Think after Laftel the SH will first go to New Marineford have some battles there's and them raid Marijoa, pehaps with Zunesha and Momo to helping get there, and with all the allies with them.
Could be that the reverse mountain is destroyed in the Luffy vs Teach fight and the SH go to Marijoa throught the Paradise, and also meeting Laboon again and using Nami map to get there fast, but would be strange for Oda to introduce New Marineford and dont use It, but pehaps the Revos will be the ones to attack there