It was to do with the change over timing. In the team sprint the lead rider and rider who comes through to finish has to change over within a set area on the track. IIRC Pendleton cam through on Varnish a bit early and was demoted.
Ordered mine. Hopefully it will turn up sharpish as my FR305 died on my after falling off my window ledge about 2 weeks ago and ive been desperately resisting the urge to buy a 610 straight away knowing the 620 was right round the corner.
Been an expensive day all in, this plus a £400 set of bars for my TT bike and now just to work out a way from keeping it from the missus! haha