I was checking SilverStone's Facebook page to see if there was any updates on the 700W SFX-L unit and spotted this interesting photo of their PSU lineup. The above picture is a cropped and sharpened view of the linked image.
As far as I know, the two mystery SFX PSUs in the front are previously unannounced units. At Computex last year they had shown off a non-modular SFX unit that still hasn't been released but these two new units are fully modular. More interesting though is the fan, which based on my measurements of the casing, is a 92mm fan. The SilverStone SX600-G has a slim 80mm fan and has built a reputation among noise-sensitive SFF enthusiasts as being bit too loud so some have been looking forward to the upcoming Corsair SF600 due to the 92mm fan that unit has. SilverStone has been at the fore of pushing SFF power supplies though so it's nice to see them firing back with a similar unit of their own. It's even possible that both units are manufactured by the same OEM, though I haven't heard any solid info on the OEM for the Corsair.
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