Upcoming MS updates for WP 8 and MS statements about all WP 8 devices being updateable to these releases...
http://winsupersite.com/windows-phone/blue-go-windows-phone-updates-coming-throughout-2013
"According to Foley’s sources, however, Blue will be preceded by three interim updates, called General Distribution Releases, or GDRs. The first, codenamed “Portico,” already shipped and has been deployed to some Windows Phone 8 customers with Nokia Lumia 920 and 820 handsets, HTC Windows Phone 8X phones on AT&T, and HTC Windows Phone 8X handsets on Verizon, among others.
GDR2 is on the way next, and is rumored to be the OS version that will ship on HTC’s next handset, the “Tiara,” which could become available as soon as this summer. A GDR3 release is also planned. In this way, you can see that Microsoft is fulfilling what I see to be a need for more frequent updates, albeit with Phone, not Windows client.
Windows Phone Blue will come after these three GDRs, and could even slip into early 2014, ironically breaking Windows Phone’s three year run of yearly updates. (Foley notes that the name “Apollo Plus,” which had previously been used to describe post-Windows Phone 8 releases, is most likely akin to using the term v.Next, as in Xbox v.Next. So these 3 GDRs and Blue are all “Apollo Plus” releases, basically.)
And while Microsoft told PC Magazine this week that all Windows Phone 8 handsets would be upgradeable going forward—that is, they will get all of these GDRs and Blue—that isn’t new information, so let’s not pretend otherwise. Obviously, the lack of a Windows Phone 7.x-to-8.0 upgrade was a one-time thing required by the platform change, and Microsoft already announced that Windows Phone 8 handsets would be updatable over the air."
P.S. I have been saying Blue is due this summer. I am clearly wrong on that and must have been thinking of the GDR 2. Apparently Blue isn't due till late in the year, maybe next.