Here's SunRace Sturmey-Archer's IGH catalog for the following couple years.
It describes new a new 5-speed family of rotary shift hubs, a new 4-speed family of rotary shift hubs, a new up-market single speed hub with an aluminum hubshell and roller actuated coaster brake and some new dyno hubs w/o drum brakes.
The all-up 4-speed looks to be two stages of the three stage XRF8(W), but with a different driver that will accept standard AW-style cogs.
The five speed looks good on paper. 64%, 80%, 1/1, 125%, 156%; even +25% steps; 243% overall. "Designed for heavy duty use". Drum brake, disc brake, coaster brake and freewheel versions.
According to the catalog, the S50 hubs, like the XRF5(W), will be discontinued.
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Thread: Sturmey for 2014-2015: new IGHs
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