From my point of view I don't think it's a fair move from coinbase to tell the community that they "thinking about adding these coins". They knew before that it would give a pump to these currencies. I am sure they won't choose them all. Do you agree?
I actually think they will choose all 5. I thought it was the right move by Coinbase, even if it is kind of funny.
It's right to announce the next coins, but in that way? A bit strange :P
Edit: Why do you think they will choose all?
I think they likely have done some initial due diligence on these coins before they announced them.