Hello, I don't know about the 8.5 or 9 but there are updates coming over for Lumia 920, 820 and 620
24-03-2013 22:58 - edited 24-03-2013 23:00
Microsoft has stated that all current WP8 hardware will be able to update to the next major OS version. This will mean that, with Microsoft usually updating Windows Phone around November (they have for 7.5 and 8) you'll be good until at least around May 2015 by which time most people will have upgraded their current phone anyway.
The updates mentioned in the previous post are Nokia Firmware only and are installed on new phones shipping now. The update will be available as an OTA update to existing phones at a yet undisclosed moment.
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