im sure they release a new asic one day after the coupons expire. probably EtHash...
Have you not done research into ETH's discussion on fork to PROG Proof of Work? They already said they will fork.
Source please ?
Go to Ethereum's YouTube channel and listen to conversations the developers have been having recently.
How about an offiical press release.
I simply listen to the developers discussion before an official release. They sound like there will definitely be a fork and it's looking like a future POW/POS hybrid.