When I shot on sony e-mount, I loved the pancake power zoom kit lens (16-50), it was really convenient.
This is a lens that could interest me for street, currently I use the 18mm F/2 at ~F/8
the 52mm thread fits nicely with filters i already have for the 18 f/2 and 35 f/1.4.
However it would need to be cheap, but I expect it will mostly become the new cheaper kit lens on the XT20/XE3 bodies and the default on the XA bodies, which means lots of cheap lenses may appear on ebay
I feel that Fuji moved in the right direction with slightly cheaper F/2 Primes, I's still like to see the introduction of even cheaper XC Primes, for those of us that need something for occasional shooting that doesn't require the build quality of the XF line, but focal lengths the XC or kit XF zooms can not currently provide
e.g.
XC 12mm F/2.8 or F/4
XC 8mm (fish eye?)
XC 23mm/35mm/50mm F/2.8 (although I doubt these 3 would be made as too much overlap with the new F/2 range)