I hope it's not via EX-Raids; however, it always has a chance. Personally, I think that maybe Celebi will be an EX, though that is iffy. As for Ho-oh, I'm thinking it will be released as a five-star normal raid, like Lugia was. In fact, maybe there's a chance that Lugia will come back alongside Ho-oh, and maybe we'll get all three legendary dogs at the same time alongside the two, kind of like all the Birds in July/August. If we're lucky, we'll get all Birds as well. I personally would like that, as I missed Entei in it's cycle through the US, and I completely missed the chance to get any of the Legendary Birds. But maybe that would annoy lots of other players who already have loads of the birds and dogs available to them. But at least, when eggs would appear, it's not this whole thing where you already know what the raid will be; I think it adds an element of surprise, which should be good, true, smart.