As per info received today from Winradio, the Excalibur will be available in March 2010. The "MW Filter" I was concerned about in my previous post is user selectable.
And the really, really good news: As I hoped, RF recording (or IF recording as Winradio puts it) can be chosen from any of the 21 bandwidths within the DDC spectrum (20 kHz to 2 MHz). I didn't ask specifically which bandwidths are selected, but I'm confident that there will be one which matches the MW spectrum nicely. The output files are WAV files.
The Excalibur will be cheaper than the USD 1,200 WR-G313e. So perhaps in the USD 1,000 - 1,100 range. Winradio expects the Excalibur to be at least as sensitive as the Perseus.
(Picture from Winradio)