442 would make it 12 chapters, and I don't think there's ever been a 12 chapter volume. Most these days are 9-11 I think.
I'm pretty certain the volume will be titled "Understand Your Feelings." As for the chapters I'm undecided. It could be 9, or 11, or even 10, as all three could make grat volume endings (with 10 chapters, ending on 440, being the biggest cliffhanger one). I'm going to put my money on 441 being the last chapter though, as I think it just fits with an 'ending' (439 would also work ideally for an 'ending' as well).
As for the cover, I'm unsure. I Think a volume featuring Dragon, Garp, etc would be too spoilerific. I reckon Usopp, Franky, Luffy (duh!) and possibly Thousand Sunny will be on it tho.