Well... it is up to all of you obviously but for me, a big part of the fun would be seeing the blocks made and pics posted as we go. That would be why I would start an album like the one I shared above. That's how the one I borrowed the idea from works anyway. It might also persuade the 'lurkers' to join next time haha!
However, if you all want to go down the surprise route I'm happy to go with the majority.
I have to admit I haven't started any blocks yet, I got a bit too involved in my EPP while sitting in the garden this weekend