I don't think they're too similar. The BH is a classic LV, it's a bag that will stay in collection forver IMO.
The Palermo has something new and very trendy to it (but hopefully it will become one of those classics as well). It looks like they have put a lot of thought into details. I really like this one. But I'm gonna wait a while before buying it, because with all the excitement around this bag, I don't wanna get carried away and then later regret my purchase.
I would love to see modeling pictures as well. I have found 2 very small pictures at a Chinese site called rakuten or something like that. I don't remember the address, but someone on this forum linked to the Tivoli, that's how I found the Palermo. I'll go see if I can find the link.