Being done by Phil Saxena (the smiley bloke in the last pic). I've talked to him recently and he's pretty pleased with how it's all shaping up (working on behalf of the local authority IIRC). I believe there might be a Phase 2 as well.
The note on those pics ("photos staged, trail not open yet") is pretty clear. Given most riders just do what the hell they want with little regard for construction, better to keep it QT and give everything chance to bed in, bind up and consolidate before it starts to take much traffic. Probably explains the general silence.
I know Phil is still up there at the moment with crew working on it. Looks good and will be interested to try it when finished / open.