I think all Windows Phones will get Apollo BUT obviously not all features.
MS_nerd once said
"Yes, all current Windows Phones will receive a subset of Apollo. The carriers are the primary obstacle in the US. I hear Microsoft is pushing hard for a Mango-like delivery schedule, as are Nokia & HTC.
Some Apollo features will be exclusive to the 3rd-gen devices expected to be released this fall on the MSM8960 platform."
also the video yesterday he clearly said what he was told, all deviced would get it.
does it make sense 1st and 2nd gen would get a SUBSET of apollo? yes. because its imposible to upgrade alot of hardware related stuff to those phones.
Also Nokia needs to be successful in Smartphone field, this would kill them or make their efforts really hard, because people wouldnt want a Nokia Phone, well Windows Phone, but LG, Samsung, HTC, has android, while Nokia chose to use Windows Phone. so Nokia depends on MS on WP decision. this isn't only about Microsoft. and if Nokia was one of the reasons why LTE WP exist, I believe they will also do something about Apollo, if something was not right.
also I just would rather believe these people saying it will, than a non-named source from The Verge. why didn't this source showed up before someone said "yes all phones will be upgradable", why the verge didn't write that article before? also the verge has written a lot of crap about WP.
Microsoft will say something later, but Tango hasn't released yet, I don't expect they talk about Apollo since its still being developed, if they never talked much about Tango.