Right now, Microsoft isn't saying yes or no. Just because they retracted the statement that "all WP 7.5 devices will handle Apollo" does not mean that all of them won't. Microsoft is probably aware that they should provide some kind of updates for people buying new Windows Phones; especially given the demand carriers like AT&T have seen for the Lumia 900. By not releasing an update, Microsoft would pretty much be putting a nail in the coffin for Windows Phone.
That said, don't be surprised if there isn't an upgrade path to Apollo for devices like the Samsung Focus or HTC HD7.