The new suggestion for service 85 is GOOD as it
provides service for people who want to go to Jalan Kayu from
Yishun and Punggol directly and also provides service for
people staying at a more "remote" Sengkang West to Rivervale (where
they will have to change LRT lines), Punggol and Yishun. However,
there are usually jams at Jalan Kayu and you would want to take
note of that. Other than that, everything else is fine.
I once speculated that route 117, if it turns out to be a
Hougang > Sembawang route, might pass by there (as well as
Anchorvale Community Club. Combined with this amended route 85,
they should help compliment with each other - it will help provide
a direct link between both Sembawang and Yishun with Jalan Kayu,
and this part of Sengkang with both Hougang and Punggol. Someone
should send this to SBS Transit 
.
And speaking of Sembawang and Yishun, here's a suggestion for an
enhanced route 882:
Enhanced route 882: Yishun > Sembawang Park (loop) via:
Yishun Central > Yishun Avenue 3, Yishun Ring Road, Yishun
Avenue 5, Sembawang Road > Sembawang Avenue > Sembawang Drive
> Sembawang Way > Canberra Link > Sembawang Road, and
u-turn at former Sembawang Road End bus terminal.
When the Montreal Drive extension is completed, they can amend
it to ply:
... > Sembawang Drive > Admiralty Drive >
Wellington Cricle > Montreal Drive > Sembawang Road >
...
Pros: restores the link between Yishun and Sembawang Park,
creates new links between the neighbourhoods along Yishun Central,
Chong Pang area, and the neighbourhood around Wellington Circle,
which is badly in need of a new bus route
Cons: route may be slightly too circuitous between the Chong
Pang neighbourhood and Yishun Town Centre. Not a problem for
passengers travelling between these two places, as there are
already routes 171, 811, 856, 858, 859, and 969 doing the job, but
may be a problem for those at Wellington Circle neighbourhood
wishing to travel to Yishun Town Centre. Route between Yishun and
Sembawang Park is also not the most direct possible.