I think you got this wrong (Engadget proper seemed to realise and removed their post), those devices have been listed as coming soon a good while now, and the ABS article only mentions newer phones getting support before older sets.
“Microsoft's not promising the world with Windows Mobile 6.5, nor are they delivering it -- it's very much a stopgap, complete with duct tape, bubble gum, and Bondo.”
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I think you got this wrong (Engadget proper seemed to realise and removed their post), those devices have been listed as coming soon a good while now, and the ABS article only mentions newer phones getting support before older sets.