Though Sprint users have had the Samsung Airave femtocell (coverage booster) for some time now, the device only offers 1X connectivity. In other words, if you're a heavy data user living in a low-coverage area, the experience has probably been less than stellar. Fortunately, Sprint appears to be working on the issue - and with another manufacturer, to boot. Landing at the FCC today, the Airvana-built Airave unit offers EVDO and a landline jack for VoIP connectivity, though there's no word on whether Sprint will enable the service (if they do, I would imagine it to be similar to T-Mobile's defunct Hotspot@Home service).
No pricing or release information just yet, but passing through the FCC is typically a positive sign of an impending release. It wouldn't surprise me if we saw it soon.