StreetComplete v6.0 has just been released 
Available on Google Play (now) and F-Droid (soon)
more info on Github: https://github.com/westnordost/StreetComplete
New Quests:
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Add building type: “What was this building constructed as?” (#25, #774, #1092)
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Add path surface: “What surface does this path have here?” (#133)
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Add one-way road: “Is this a one-way street?” (#370)
Enhanced Quests:
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House numbers: Can now answer that the building has no house number (#351)
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Parking type, fee and access: Include relations in search for parking areas (#1033)
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Add road surface: Show different surfaces initially for different types of roads, e.g. for tracks more unpaved surfaces
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Add cycleway: Now understands bicycle=use_sidepath and will not show the cycleway quest in that case (#1084, #1087)
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Wheelchair access: Added internet cafes, theatres and casinos (#1086)
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Bicycle parking: Clearer wording (#1038)
Small Enhancements and Fixes:
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split up English into US-English and UK-English
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Update privacy statement
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Add confirmation dialogue on resetting quest enablement to default (#1095)
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Make background of compass needle not flicker any more (#1057)
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Cursor does not jump to the start of the input any more when pressing [abc]-button in house number quest (#1093)
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Correct wording in mark completed construction quest