@Naisho:
While waiting for tomorrow spoilers, lets make some monday predictions.
When Magellan would be about to confront escape team he would be taken out by BB's darkness. After that BB's role to make freeway to MHQ for Luffy will be completed.
- BB taken out 1000-bazookas squad on lvl.4
- BB clean lvl.2 from poison (Buggy got a chance)
- BB destroyed marines on surface
- Shiryuu destroyed communication room
Not sure, but Admiral (Akainu) will come for BB and will be confronted by Luffy-team on his way to ID.
Reason for BB to be in ID. ID itself is weapon. Remember - lvl.4 is all about heat and lvl.5 same which cold. So which Nami in mind:
heat-ball + cool-ball => Lightning
Control room is on lvl.6, range of destruction is enough to reach MHQ. When BB talking about shaking the world he mean to take out both Marines and WB in MHQ in one step by using this method/weapon.
That's a pretty cool idea, but I don't think a giant lightning cloud could take out admirals or anything. I think an admiral showing up is a bit too extreme, since they're anticipating WB showing up. A Vice Admiral would be a lot more logical, and it would have the added bonus of him running into Buggy and company first. The level 2 riot would be annihilated for the… 4th time?
I really can't see a scenario in which Luffy faces off against Magellan again, thinking like an author. Magellan would therefore have to be stopped, and the options are either BB, Shiryuu, or someone on Luffy's team. I think the obvious answer is that BB will come back laughing and Magellan will have to deal with him. However, I also think that the person investigating Shiryuu's actions could get a report back to Magellan that Shiryuu betrayed them. Magellan may consider that to be the bigger threat. My guess is that he'll find out the news about BB and Shiryuu at roughly the same time.
I guess my official prediction is that Magellan will hear that BB has recovered and Shiryuu has betrayed them at the beginning of the chapter. Magellan will unhappily face off against BB. Luffy's team will catch up to Buggy's team (though I half expect there to be one last obstical for Buggy to need saving from). Shiryuu's plan will become clear, and it will be the complete destruction of Impel Down. We'll get to witness an awesome fight between BB's crew and Magellan. The chapter will end with Luffy reaching the entrance of Impel Down.
EDIT:
@Naisho:
Yes, but Luffy, if I remember right, mast be reported dead after his loss to Magellan. After that BB was reported to be seen in ID and now communications which ID is lost. Kizaru dos not have anything personal against BB, so he don't volunteer to go in ID.
The information about Luffy came out shortly before they lost communications. If you remember, Onigumo reported the situation to Ace.