I was on a train towards Yew Tee station when I saw these orange buses at the Soon Chow factory. At first, I took little notice of it, however, it strikes me that the colour is similar to the orange on the current sentosa services. Also, it's chassis is low floor (although got one step I think). The body work likes like any typical Soon Chow coach bodywork.
Check it out if you can. I believe these are the new buses that were mentioned during Sentosa's reply to some bus fans about the current buses having too many steps.
Yes, this could possibly be the Sentosa B7Ls we were discussing. They should be on the roads by August or Sept.