We have been travelling to and fro IKEA / Courts tampines extensively for this holiday season! And we have been using the new short-cut in Seletar too! Entrance and exits at Jalan Kayu and Seletar Airport. Journey takes about 5 to 10 mins (depending how slow you drive).
When driving along this road, take extra pre-caution if not familiar with the course. There are a couple of pot-holes along the way, muddy uneven terrain beside the road. The night drive is slightly dim as lamp-posts are pretty far apart.